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Yes! The OMGIRC team has yet again put up a custom pre-jailbroken firmware for a quick 1-step update! Just shift-click restore in iTunes and select the custom ipsw firmware! That's it!
Please check the hash of your download, we take no responsibility for what you do with the firmware provided or the phone you plan on updating. Just double check the MD5 hash to be sure you have a complete download :)
Download: 2.2 Firmware for iPhone 3G
http://www.omgirc.com/files/iPhone1,2_2.2_5G77_Custom_Restore.ipsw
[ MD5: c51a21390cce41553350eebdd6dc7817 ]
Enjoy!

Used: Pwnage Tool
[ http://wikee.iphwn.org/main ]
Storage: 1gig partition (room for all those 3rd party apps!)
Version: 2.1 (Hash: 5F136)
Download:
2.1 2G
http://www.omgirc.com/files/iPhone1,1_2.1_5F136_Custom_Restore.ipsw
[ MD5: 9706b0c79249d49c2e862654edd373ff ]
2.1 3G
http://www.omgirc.com/files/iPhone1,2_2.1_5F136_Custom_Restore.ipsw
[ MD5: c0590296a08957948710bef26581a109 ]
Read on if you don't know how to install this firmware using iTunes

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