If you want to upload to the latest 2.0.2 version of the iPhone operating system, and you have a PC, check out the new QuickPwn for Windows, which now supports it. Yippee Kai Yay and all that. Mac users, hold on because they are working on the Mac version too. Until then, you can always use Pwnage. [iPhone Dev]
I can confirm that if you do a full restore to 2.0.2
(not jailbroken) ..
and then you quickpwn to 2.0.2 (with the 2.0.2 firmware) it works flawlessly too!
(I had an Itunes database corruption, so I tought the jailbreak was responsible "and not my playing around with chmod! " so I went 2.0.2 the "legal" way... I missed cydia so much... when I saw the quickpwn supported 2.0.2 .. I couldnt resist!" )
I didnt loose any of my installed (bought) apps. and I got the pinapple and the cydia/installer and 2.0.2 shows in the about page. !