It's called 3G8900TodayQLSlotnav, just changed the background to a Windows 7 Background I found in the Windows 7 preview site. It is the first link. Some additional free themes for 8900 :
3G Theme (similar to IPhone) :
3G Navi With Hidden Today
3G Navi Without Today
HTC Hero for the Curve 8900 :
Download
Calendar, Messages, Sms/Mms Version:
OTA
Calendar, Messages(Combine) Version:
OTA
Info/Feedback:
HTC Hero Theme Page (8900)
Hybrid Pro :
Combines IPhone, Android, and blackberry Icons into 1 theme :
http://www.owinwood.co.uk/stormTheme...Hybrid_Pro.jad