Yesterday i’ve updated my iphone from firmware 2.2 to the latest firmware 2.2.1. Then JBed it by QuickPwn 2.5 by Dev-Team. Everything works fine, even several of my favorite 3rd-party apps for firmware 2.2 still can be able to be running very well, like iCosta 2.2 PinYin , OpenSSH + BossPref, and UCWeb 6.
2.2.1 is said to fix some bugs and make Safari more stable, well, that’s what they said. Perhaps one day of 2.2.1 experience is not enough for me to point it out.