Loki is new to me and it looks pretty neat. It grabs your location based on some magic involving WiFi (and presumably your IP address), then allows you to do local searches based on that. They've had a Windows toolbar for awhile now, and they've just added a Mac and (more importantly for us) a Windows Mobile client. If you've read between the lines, though, you're realizing it will only work if you have WiFi on your WM device, so Treo and Blackjack owners (among many other) need not apply. More people who need not apply: folks who live outside their limited coverage area.
Now you can get the same Loki WiFi location goodiness on your Windows Mobile device. Loki Mobile allows you to locate yourself and search locally on any WiFi-enabled Windows Mobile device.