I’ve been reading around here for a few days, reading and modding. Picked up a 6700 from Sprint last week, simply because of the massive aftermarket support - and impatience (don’t want to wait on the 6800 sometime this year).
Love the phone, capabilities, and practicality. Especially with a few tweaks.
As of 2/27/07:
1gb miniSD
Power Vision Access pack [unlimited data]
Total Commander
Sprintware removal (hard reset after activation) http://ppc6700users.com/forums/viewtopic.php?t=8
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Magic Button http://www.pocketgear.com/software_detail.asp?id=7438
ApacheHaxSC http://ppcgeeks.com/cab-file-to-do-common-hacks-and-increase-system-performance-t819.html
MMS capable http://www.ppcgeeks.com/real-picture-video-mail-for-your-sprint-ppc-6700-t5.html
WiFiFoFum http://www.aspecto-software.com/WiFiFoFum/
Disabled menu sliding / animate http://ppc6700users.com/forums/viewtopic.php?t=27
Glyphcache hack http://ppc6700users.com/forums/viewtopic.php?t=39
File Cache Boot http://ppc6700users.com/forums/viewtopic.php?t=180
Disabled stupid SMS text sent http://www.ppcgeeks.com/disable-the-sms-sent-notification-t1044.html
Always on internet http://ppc6700users.com/forums/viewtopic.php?t=50&postdays=0&postorder=asc&start=0
Delayed ringer / Slot Cycle hack http://ppc6700users.com/forums/viewtopic.php?t=522&highlight=msl+slot
Manual ActiveSync setup http://ppc6700users.com/forums/viewtopic.php?t=437
Deleted Phoneoff.wav http://ppc6700users.com/forums/viewtopic.php?t=169
Disable Vol. Slider Beep in call http://www.ppcgeeks.com/stop-the-annoying-beeps-when-you-change-volume-during-a-call-t1355.html
Cleared stock favorites http://ppc6700users.com/forums/viewtopic.php?t=26
Extended Key backlight http://ppc6700users.com/forums/viewtopic.php?t=212
“Deleted” bottom taskbar (removed comm mg & orientation icons) http://ppc6700users.com/forums/viewtopic.php?t=2840
TodayScreen Speeddial http://www.ppcgeeks.com/treo-700w-today-screen-speed-dial-mod-t19.html
Smartskey http://ppcgeeks.com/guide-to-using-the-6700-or-any-wm5-device-one-handed-t522.html
WeatherPanel http://www.ppcgeeks.com/marsware-weatherpanel-und-custom-skins-t822.html
pRSSReader pRSSreader
Tetris Smile http://www.ppcgeeks.com/tetris-t465.html
DL’d GoogleMaps http://www.google.com/gmm/index.html
Misc Reg. Hacks: http://ppcgeeks.com/wm5-registry-hacks-huge-collection-t113.html
-Upped ringer volume
-Repeat notifications (missed calls etc)
-Nix window sliding
-Moved internet temps to miniSD
Registry backedup to miniSD & desktop PC
So far so good! 
-Nick