A good few things lots have been said about it in this thread. A few things for you tho.
Faster ROM
Quicker Updates
Custom mods
Overclocking
If you go over to the XDA forums and click on a ROM topic then they will have a list of all the stuff the ROM does
okay.. have had a look and there's LOADS of choice there and being honest i'm a bit overwhelmed. I was after something which has sense, android 2.2, the most features (ie 720i vid and flash etc..) and works; i take it at the moment there's no given "best" rom?
B@