The iOS 4.2.1 firmware was released by Apple a few days back and we gave the iOS 4.2.1 IPSW download links just after it was released. The main feature of this firmware is that it is coming to iPad also. Many users already updated their iPads to iOS 4.2.1 and some of them have jailbroken it using redsn0w 0.9.6 b4.
An active member of the iPhone Dev Team, MuscleNerd, have released a spreadsheet of the list of iOS 4.2.1 compatible cydia apps for iPad. This iPad iOS 4.2.1 Cydia compatible apps list will be updated whenever there is a change.
Get the list of iOS 4.2.1 Compatible Cydia Apps for iPad from here.