HTC has launched its new HTCSense.com website. Designed as a companion site for (so far) the HTC Desire Z and HTC Desire HD, it offers services such as backup, location services (to find your phone if you have misplaced or lost your phone), contact management, a selection of tested applications, and more.
Too bad the HTC Desire Z and HTC Desire HD are not available yet.
Note: As I write this, it appears that HTC is dealing with a redirect issue. The address http://htcsense.com works whereas http://www.htcsense.com does not.