http://www.howardforums.com/showthread.php?t=1369284
First of all, welcome! Next, the link above is a thread over on HoFo that discusses enabling GPS on the stock Alltel ROM. This is a killer app to have on your phone. I'm using Microsoft Live to get my location and maps and it is awesome.
Another killer app (although not free) is WMWiFiRouter. This lets you use the 6800 like a WiFi router.