I've been VERY distracted by a tool I decided to write (working name was SmartLocation, current release name is GPSCheat!). As testers played PB game, I want to be able to be near them to play around where they were at. There's some fake-GPS apps out there, but not very well done and a pain to use.
The biggest thing was having to keep re-enter locs. GPSCheat lets you add a (named) loc to a list, and then you can just click to go back. Also helps a bit with getting the user setup (still a pain, but at least guides you through the process)
Main site is at http://www.gpscheat.com
It's out on the Market Place, selling for $1.29 (Woot! Got an actual released app on now, Finally! Just wish it has PB :)