Here is a link for the New Alltel Rom. I used it to flash two of my PPC-6800 and it is from Alltel. I do not know why they have not posted it on their web site by, if you are looking for WM 6.1 with GPS this is the one you need.
http://forum.xda-developers.com/showthread.php?t=433957
I was told that it was going to be released today but still have not seen it on the update site.