So what did you downloaded from cydia that is compatible with the ipad? I'll try to list some apps I tried that works/others tried and works
WARNING: DONT download apps that hasn't been updated/optimized for iPad yet or your iPad WILL go haywire and you'll have to restore!
- Backgrounder (turn on badges)
- Quake 3
- Mobile terminal
- Pro switcher
Working for some/not for others