The iphone development team released the long awaited version of Quickpwn today for Mac OS X. This will allow you to quickly jailbreak firmware 2.0.2 without creating a custom .ipsw and restoring.

Note this will not jailbreak earlier firmware versions and will change the baseband apparently. It is currently available as a torrent and can be downloaded from here.

http://thepiratebay.org/torrent/4369186/QuickPwn_1.0.0.tbz