Well, first up I normally go home and then immediately update the character sheets on my PC and whack in any downtime details to the campaign calendar. Yup, I also stick in any GM notes on each character that are pertinent, say that they've pissed off a contact or left something behind that could come back and bite them. I can then review the game and the occurances/consequences of their actions and then hack out a few news items that will later be seen or heard of by the runners. (Remember the good old Seattle News-Intelligencer reports Darth?)
So, pretty much like you I try to keep the gameing environment alive and vibrant. Actions will have consequences - maybe not immediate ones, and maybe not always heard of by the same group (I also have had several different groups running in the same timeframe and sometimes they come across the results of the other group's actions). I also try to keep a realistic event planner as to weather, festivals, social situations/trends etc. so that the world is more believeable. Plus these things make for interesting opportunities/flavour to the runs - nothing like knowing its winter to put off swimming across Lake Washington to the target or hot humid summer days to get the team to strip off all those heavy unbearably warm kevlar layers or start taking stun fatigue. Heh.

One recent occurance was the resulting end to a certain scenario from 1st Edition (#3105). I tinkered with the overall threat level and altered a few things about it - in the end scene the bad dude had tracked down the missing artefact to a Talismonger buddy of both the combat mage and raccoon shaman players. (The combat mage had originally taken it to them for astral analysis and hadn't told them to keep it quiet, so the Talismonge had stuck up some queries about the artefact on the Matrix, including a full 3d holographic image in an attempt to find out more information. this led the bad dude to the Talismonger's ranch in Snohomish whereupon he subdued them and then got them to call in their runner friends to return the artefact. yup, the good old hostage brings you to me ploy.
Well, the runners responded mainly by the face and ex Lone Star SWAT weapon specialist calling in their own contacts and thus imparting the whereabouts of the big bad dud to the Lone Star detective hunting him down with gusto. They then pulled out of the area waiting for their buddy's SWAT team to handle the situation (seeing as the Talismonger was a legit citizen), meanwhile the mage and the shaman were having a heated
tete a tete about returning the artefact to save their buddy's life (big bad dude had strapped a liquid explosive bomb to the Talismonger's chest y'see). Of course, the mage being more "exposed" to the artefact wanted to keep it and let the SWAT team sort it all out. The shaman eventually knocked him unconcious, retrieved the artefact and then went in to do the trade off on his todd just as the SWAT team were moving on the ranch.
He tried to con the bad dude and his remaining mage accomplice with an empty case and fluffed it. Just at that moment the SWAT team are converging on the ranch's back doorstep, the unconcious combat mage is still in the shaman's van parked out front, and the vengeful LSSS detective chooses that exact moment to turn up with his fully armoured FRT bullyboys in a panzer. Well, needless to say it all went horribly wrong for the Talismonger.
BOOM! The ranch went up taking out several of the SWAT team who were inflitrating their way into the kitchen. The bad dude started running for cover whist popping off highly accurate caps at the LSSS FRT troopers. The shaman ended up in a one on one magical dual with the bad dude's mage associate, eventually only defeating him by grabbing the artefact and channeling its power to fry the bugger with one awesome Powerbolt. At that point his totem went oopsie and he saw the thing he'd released from the artefact's ancient prison (a wraith actually that had now fed enough on the death energies around it to go free). He promptly passed out via drain overdoseage.
Wrapping up: Shaman severely wounded and in custody of the local authorities (LSSS) who want answers to what happened and why so many of their troops and SWAT team got killed there. He gets off charges with his false ID and a convincing story backed up with his tribal connections that he was just there to visit the Talismonger on business. Besides, he didn't really commit any crime that they could prove and the magical analysis of the associate mage's (RE: terrorist's) corpse was inconclusive due to strange background count and spiritual interference. He was then sequested away by his local tribal connections to recuperate in their care and eventually understand via their shamanic lodges just what he'd done in using the artefact. (His jaw dropped open when I mentioned a reference to Earthdawn Horror Marks!)
The combat mage had it a little worse. Well, not only was he effectively Horror Marked by his association with the artefact, he'd also been picked up by the Star for "questioning". Unfortunately, they'd previously raided his high class apartment earlier that weekend and although he'd escaped and then remembered to use a water elemental to erase the hermetic summoning circle chalked out on his floor, and thus eradicate his astral signature from it before LSSS forensic mages compared it to the corpse of the other bad dude's associate mage he'd wasted with a force 10 Manabolt three days ago. Yup, that's premeditated murder and they got his astral signature from that cooling corpse. They definately wanted answers to how he was involved with the terrorists who killed many of their FRT troopers during that previous sting operation. The fact that he'd also left behind a fully decked out (and unlicensed) AK-98 assault rifle under the bed along with enough APDS and EX-Explosive ammunition and IPE offensive minigrenades to severely "disturb the peace" was merely icing on the cake for sending him down. He's currently doing time at a local high security detention facility that specialises in magically active inmates. Oh yeah, lots of waht-me-worry, magehoods and experimental weird stuff for this cop-killer. The player has now got a rigger character instead. He hasn't asked as to what happened exactly, but did originally tell the team to waste him if the Star got him as he knows the rumours of what they do to mages.
As for the face, she's hale and hearty and managed to get a payoff from certain acquired goods. The weapons specialist had some explaining to do to his SWAT contact, but they saw it all got fluffed up because of the impetuous arrival of the rogue detective. The Star have now demoted him and shuffled him off to a more appropriate posting (Chicago traffic cop) because the bad dude managed to pull out a diplomatic immunity ID and walk off scott free leaving the whole mess in his lap.
Meanwhile there's a wraith free in Seattle and it's very hungry...