remember that Android is open source. Everything you see is actually the stock apps but enhanced by htc since they have access to the code and not some replacement with the stock app buried deep like they do with winmo. But I believe that the homescreen can be reverted though if it's anything like the hero, just to settings / apps and revove the default action for the homescreen, if it goes well when you go back home it will ask you with what app would you like to do this? Home or Sense. Choose home and you should get the standard android homescreen, but that's about it since everything else is htc-fied