It also has a Sprint replacement for the wifi hotspot tethering so the user is required to pay $30/mo for that feature that is normally native to Android even when they're already paying for an unlimited data plan.
It has sprint logos and music that plays on startup and shutdown that cannot be removed without rooting the phone.
A recent update added a media portal where the user can purchase movies and tv shows from Sprint partners. Also a "system app" that cannot be uninstalled.
There was a case earlier this year where Vodafone issued an update which added some crap like this to peoples phones, but enough people complained that they removed it in their next update which upgraded people to Froyo:
http://www.theregister.co.uk/2010/08/12/desire_android/
Maybe people in the US just don't complain enough ;)
It's really a shame. But maybe Google is taking a longer-term view than many here give them credit for. I still believe that their goal is to commoditize carriers. They tried to push too fast with the Nexus One and google.com/phone and got burned, but that doesn't mean they've given up.