I have a running campaign that at least originated in the Barrens.
http://forums.dumpshock.com/index.php?showtopic=17187As for fixed locations, well alot of Redmond is undefined by SR. The most important landmarks etc. are:
Glow City, afallout area where the nuclear power plant exploded back in the day and mostly populated by mutants, including the Rusted Stilettos gang
Redmond (a.k.a "Touristville") the best area in the Redmond barrens, where LS actually dare to enter, community works more or less, and where most SINers in the barrens live. I think it's fairly westwards, neighbouring Bellevue.
Well that's mostly that. There are other locations in Runner Havens and the much better old Seattle Scourcebook, and some on the internet, but they're not placed on any map so who knows where they really are. Best bet is to use todays maps etc. for geographical data and replace todays' suburbian homes with cheap tenements, old abandoned office buildings, and places with more or less just rubble.