1) Having your Technomancer perform a Erase Data Resonance Realm Search to erase the Firewall or Analyze programs from a node. Or that UV facilities account list. Timing this can be a pain but the enemy spiders being booted from the system and then having to hack their way back in is incredibly useful on a run. Erase Data should also be used on a fairly regular basis as a poor mans Erasure to totally get rid of those burned and used SIN's of yours or to make sure that nothing about your team that you don't want on the matrix is on the matrix. Another nasty trick with this is to erase a SINer that you want out of the way for whatever reason, or the transaction records of that certified cred stick being used so that you can go and use that forgery that you made as well.
2) Get a R2 Smart Jammer from Arsenal and tell it to not jam your tags but to jam all other tags. They equip yourself and your vehicle with reprogrammable tags slaved to your ID comlink that are set to automatically display the correct information for that ID.
3) Buy an RFID tag, they have a capacity of 1. Put a R1 camera on it (with all the options that are useful to you or that you can afford), put it on the back of your head/helmet. Congratulations, you now have cheap rear-view vision. Buy a couple dozen more and load each one down with different sensors; R6 Cyberware Scanner, get several and it's unlikely anyone will get lucky enough to beat all the tests. This let's you know when someone with Cyber get's within 15 meters of you, and finds a lot of hidden weapons. Basically look at the list of sensors and if it takes 1 capacity load it on a tag and carry it with you, get several if they are making any opposed rolls.
4) A continuation of 3, buy a few hundred RFID tags with Cameras on them (probably with the ultrasound enhancement to get around improved invisibility) and when you go on a run throw these things everywhere around you. Slip them under doors (to see what is on the other side), slap them on the walls so that you can watch your back, throw them around corners so that you don't run into an ambush. Basically sprinkle them out like candy; at only a hundred nuyen a tag these things are dirt cheap (and you can recover a lot of them on the way out if you aren't in a rush and are feeling cheap) and they will save your life.
5) Slap those nifty little RFID sensor tags on everything. That KE or LS patrol car? Slap a single stealth tag on the front of it and you can track it in real time (roads with GridGuide are part of the matrix mesh network). It's relatively easy to get these tags on pretty much every cop vehicle in the Sprawl (or at lest the areas you are running in) and it can be a god send. Throw a bunch up at every street corner, in the lobby of every business, etc. It's a dirt cheap way to make yourself an unnoticed surveillance network around the sprawl.
6) Find the places that you normally go to shop that check your SIN (pretty much everywhere that isn't sitting in the Barrens). Most places like your favorite restaurant are using an R1 or R2 SIN scanner. Hack it (or have your teams hacker hack it) and bury a little virus in there that says every time it receives a SIN to check "Does this match XXX-XXX-XXX?" If the answer is no then it runs the scan normally, if the answer is yes then it never runs the scan and just throws up that it's a valid SIN. This is a great way to extend the life of your SINs as they aren't actually being tested. Hacking something like Weapons Worlds R6 scanner will be more difficult but it's still within the characters grasp, basically do the same thing again but throw in the scanner saying that you have all those nifty licenses that you need for whatever you want to buy, and perhaps the Ares discount.
7) Are you a hacker? If you aren't on a run then spend your time hacking everything you can and burying hidden accounts, back doors, hidden access points, and legitimate accounts everywhere. The same if you are a technomancer. You never know what will come in useful on a run so it's best to have as many options as possible. This runs the list from hacking the local Stuffer Shack so that you can view their security camera feeds and get a list of who's shopping there to the local coffin motel to GridGuide and the Star. Apartment buildings, hotels, the bus systems passenger list, the shops at the mall to grab their security footage and customer lists, city hall so that you have easy access to building plans, the power company so that you can easily shut off power to your target when you hit it on a run, the water company, the local schools, the train system, local stores, the local MSP's (easy way to find access ID's). If you have GridGuide, the bus system, the trains, and the local cab companies then all you need is a single RFID tag, SIN, access ID, etc. to track most anyone in real time around the sprawl. Even if you have to rehack these once a month or so to maintain your access it is well worth it. The real fun occurs when you hack KE's feed on all the surveillance assets and can visually track someone in real time or run that data against a facial recognition system, etc.

9) A real easy way to get rid of bound spirits and watchers is to have your mage use Astral Projection and then trace the connection from the bound Spirit or Watcher to the mage, you then Assense them. That let's you create a Symbolic Link at a threshold of 4. When it's about time for the run you hit the mage with one of a number of kill rituals depending upon personal preference. I personally like using Control Thoughts, if you can beat them by enough for it too last a bit, and having them order their bound spirits to all attack the on sight hacker or mage before having the mage kill himself. If a site is using spirits from multiple mages, track them all and prepare simultaneous kills on them all. If you kill the Spirit first then the Mage will instantly know and will raise the alarm, however remove him and the spirits go away as well.
10) Demolishers (Augmentation) and Smart Demolishers are incredibly useful. Demolishers are about the best way to dispose of hot gear, corpses, and anything else you don't want cluttering up the living room; but they can get a bit expensive if your GM is stingy with the nuyen so go and steal a few hundred units from a local construction/demolition company. Where these can get real useful is when you are doing something like raiding that UV facility with a mage or two sitting deep in a buried vault and using the fiber optics wired throughout the entire base to attack you; well smart Demolishers can be set to eat only say, fiberoptic cable. A bit on the end and that entire system throughout the whole facility is eaten. 2.5 kilometers of fiberoptic cable weighs about 85 kg. Smart demolisher's can eat that much in 7 hours. You need to sneak the initial unit in before your run but that is far easier. There are lot's of nifty things you can do with this if you get creative.
So what have you seen or done that's a nifty little runner trick.