Yeah... I miss the winmo phones with the ability to dictate what rotates and would love to see an app that does that. I use "Rotation Toggler" which is a free app from market that can disable the rotation by pressing and holding the search button. Comes in handy. Would be nice if this feature were built into the rom, but eh...
Currently using: Motorola Atrix 4G™
HTC products I've owned: BlueAngel (dead), 3125 (retired), 8125 (dead), 3x 8525 (retired), Fuze (Stolen!), Aria (Mom got a free upgrade to this one), Inspire 4G™