ellz, yes was running rooted RC8, i did however revert back to the proper RC8.
let me backtrack here, to enable rooting you have to downgrade to RC7 (RC30-33 for USA) first, this is to exploit the programming which allows root access, then you do some other bits to then upgrade to the latest rooted (hacked) RC version which has extra goodies of course.
so cause of the freezing probs i went back to RC7 and then let the phone ask to upgrade to the proper latest version (via market) and it still froze, hell it even froze after a full wipe/reset (power and home key) on the sign in screen.
so its gone back to the ebay man..
@ parthiban, sim unlocking was as simple as entering a code, the ebay guy the phone came from does it for 15 quid, you give him your IMEI and he emails back with the code.
Im on O2 and have full functionality. not sure what you mean about loosing the google part.. you need a google account as far as i know to get the phone running.
Ie turn on the phone from new and you have to sign in or create your google account. this will then sync and setup your gmail, gcontacts and gcalander for you. of course you dont have to have contacts or calender, but certainly a gmail account regardless of if you use it or not, the G1 does however allow for other email setups.