I'm guessing you are referring to 'jailbrake' apps?
In most cases yes, though some of them are now available on the App store(legit?) also.
I've long since went back to 1.1.4 because of the craptastic performance of 2.0.x
With out specifics we can't answer, eg does BossPrefs work on 2.0.2 or does springboard work on 2.0.2