Let me state mine, eventhough it will be ignored anyway woohooo

ASTRO file manager (some prefer EStrongs file explorer) - file manager
APNdroid - let's you toggle your 3G on/off
Astrid - todo/reminder app
AK Notepad - something like a sticky note
Barcode scanner - scan barcodes...for fun
Batterylife - monitor your battery life (shows % left)
ColorDict - offline dictionary
Compass - a digital compass...for fun
Divi Clock - a small android clock widget (even comes in 1x1 size)
Opera Mini beta 5 - alternative browser to the stock android browser (fast but does not support multitouch)
racing thunder lite - a racing game using your phone's accelerometer to show off to your friends
silent boot - if you are using HTC, this can turn off the loud startup sound
stats - monitor your data usage (3G, sms, call durations, etc.)
sticky note - a sticky note widget on your home screen
uninstaller - lists all the apps you have downloaded and choose which to uninstall
seePU - system monitoring utility (i find this app draining my battery though)