battikh wrote^^
yeah, but the nexus one has equal or better specs in all fields, HD2 just has a bigger screen, but they still both have the same screen resolution and the nexus one is much cheaper than the HD2.
So between an HD2 and a 300$ cheaper more performant with more features phone, i'd go for the second choice :P
I can't find any better hardware component the Nexus has; Actually performance wise, I really doubt the HD2 will lag behind. Hard SPL has been released for the HD2 and the flashing has begun :P
Don't forget, the HD2 as well as HTC branded devices has a great community on the internet ready to support you, so think twice about it. Windows mobile 7 is on the way, hopefully officially upgradable as rumored.
Android porting on the HD2 is progressing noticeably and by that time, you'll have to make up your mind ;-)