[pjsnyc]

Here's some of what I have installed on my Diamond.

Skype - for initiating international calls dirt cheap (need headset unless you want everyone to hear your conversation)
Palringo - for IM
Qik - for live video streaming to the internet (it saves the videos automatically too)
Pocket Sports Center - very simple gui, very simple scoreboard for most of your favorite sports and/or teams
Ticker Tape - for when I want to bang my head against the wall in those tight situations where I have no reason to
vTap - for when I cant find that video in the youtube app.
PockeTwit - great twitter application with gps and search.
G-Alarm - alarm application that forces you to solve simple puzzles to snooze/turn off
Pocketshield - best locking program barnone
WMWifirouter - for tethering my iPod touch and other wifi devices
psShutXP - for soft resetting
skybook - not so great, but what other alternatives do we have that work to some degree? (and dont say m.facebook.com)