As you know, I have kept a list of firmware IPSW location for ease of download. The list is updated with iPhone firmware 2.2. If you need to download the firmware file directly, please go ahead and check out my post here.

Warning: For Jailbreak iPhone user, please do not upgrade to firmware 2.2 until iPhone Dev Team announces the next version of QuickPwn and PwnageTool release. For details, please refer to
this post about Jailbreak Update on firmware 2.2. Also you may read my post about iPhone Dev-Team announcement.