you can re-sync your iphone on itunes and retain all your previous apps, music, etc.
The beauty with quickpwn is that it doesn't regisster with itunes (apple) so hook up to itunes and do as normal.
This is working on mine 2.2.1 (only installed cydia as installer is pants!)
Also you can register the same CC as before with no penalties.
PS quickpwn is the best on the market by far, so trust these guys as i have never (touch wood) had any probs. i have restored once, when installer decided to included 1298 updates after installing a rouge source.