Via MobilityDigest we learn that the Amazon MP3 store and Blockbuster video store cabs have been ripped from ROM images for the T-Mobile HTC HD2.
At present it is not known if the cabs are functional or what restrictions there are on their use, but hopefully they do work properly and allow easy access to purchasing media on all Windows Mobile phones in the region, something which should really have been there from the start.
The Amazon cab can be found here and Blockbuster cab here.
Thanks DavidK for the tip.