I havent done too much to my ipod touch, jailbreak out of the box

right now I have
colloQ - IRC client
mobilechat - aim/msn/icq client
summerboard - theme manager
synchstep - plays songs based on how fast you are moving
mobilescrobbler - last.fm client (awesome app)
intelliscreen - add stuff to your lock screen
ipowerhour - drinking game

i got some good themes from ipod-touch-themes.de

once we get a good list going we can make a pinned topic

Touchpad Pro - Turn your ipod touch / iphone into a mouse

I use it about every night, my laptop is plugged into my tv over hdmi and i watch movies through it, i have the laptop closed beside me, and i just use my ipod as a mouse while its on the tv... its quite convenient

Here's what I have

Games
4Balls - Connect 4
BallFight - Random ball game where you try to attack the other team of balls with your balls.. lol
Chess
Contrasense - Fun driving game where you try to avoid traffic
Dactyl - Try to touch all the bombs before they blow up
FiveDice - Yahtzee
gameboy4iphone - Gameboy emulator
genesis4iphone - Genesis emulator
gpSPhone - Gameboy advance emulator
iCopter - Helicopter
iSolitaire - Solitaire
iSlots - Slot machine
Labyrinth
Mines
NES - NES Emulator
NOIZ2SA - Weird geometry wars type shooting game with miscellaneous shapes.. idk how to describe it. lol
ParkingLot - Try to get the yellow beetle out of the parking lot
Pool - Billiards game
psx4all - PSX emulator
PuzzleManiak - Various puzzle games
RagingThunder - Fun racing game, highly recommended
snes4iphone - SNES emulator
Sudoku
SuperPong - Bounce a ball against a bunch of blocks to make 'em disappear
T4Two - 2 player tennis like game
Tetromino - Tetris
TowersofHanoi - Google it. lol
Tris - Tetris (recommended over Tetromino)

Utilities
BossPrefs - Configuration stuff
BossTool - Free up disc space (moves fonts, ringtones, and apps to the 2nd partition)
Capture - Take screenshots
Categories - Allows you to organize your App icons into categories
Compass
Converter - Convert miscellaneous units to other units.. very handy app
Cydia - Like Installer, but much preferred by me.
MMiThemer - Preview, download, manage themes (still beta)
Installer - Download applications
iPark - Keep track of where you parked in a parking lot
iPlot - Graphing calculator type applcation
Mobilechat - AIM/ICQ/.mac/XMPP/MSN client
Poof - Used in conjunction with Categories, makes icons disappear
SMBPrefs - Manage your summerboard themes
SysInfo - System info
ThemeBuilder
Touchpad Pro - Use your iPod to control your mouse, you can even use it to view your comp screen. Good app!
ZIP Codes - ZIP code directory

Miscellaneous
Band - Play various instruments
Excuses - Random excuses for the those times you can't think of one
Flashlight - Turns your iPod into a flashlight
Go-USA - State/capital app
Guitarist - Play the guitar
iCountDown - Keep 4 simultaneous countdowns
iQuiz - Impossible quiz
Jiggles - Play with breasts!
LEDBanner - Kinda like a marquee
Magic8 - Magic 8 ball
MxTube - Download youtube videos directly to your iPod
Periodic Table - Very good app
Pianist - Play piano
redLight - Red flashlight
ruBooks - ebook reader, along with some other file types
weDict - Dictionary
Wiki2Touch - Wiki articles
Yes/No - Decision maker

Cheers!

P.S. DO NOT ask where to get ROMs!

i really dont get having so many apps, do you actually use them?

also I just finished installing vistaperfection 2.0 and touchpad pro, amazing. Thanks for those

Well, games are games. It's nice to have a variety. I use most of my utilities. I find use for almost all my apps actually.. perhaps not on a daily basis.. but on occasion. Some my friends like certain ones, so I keep 'em. They're all organized anyway, it's not like I have 7 "pages" (springboards) of applications. lol

I just got tap tap revenge and it is actually a lot of fun definitely check it out