For anyone who is running the Win7 RC, are you running into any unexpected problems with regards to hardware incompatibility? If so, have you been able to work through them in what you would call a reasonable fashion? Any big name things out there that are breaking with Win7?
EDIT: Make that devices AND drivers per David Collantes' answer.
EDIT 2: Would like some special attention to items that worked great under Vista that now are not-so-great under Win7.