Well that didn't take long. The HTC Pyramid (Sensation) ROM that leaked yesterday has already been hastily ported to the Desire HD, thanks to XDA member capychimp. As you'd expect for a port of a leaked ROM less than 24 hours old, there are some pretty serious bugs to be found, and needless to say you won't be using this as your daily driver anytime soon.
Nevertheless, what it will let you do is try out some of the shiny new 3D features of the Sensation's Sense 3.0 UI on current-generation hardware. A few more screenshots can be found at the source link. Quick video of the ROM in action can be found after the break. [XDA] Thanks for the tip, Kristopher!