T-Mobile and HTC recently released a minor revision to the myTouch 3G we reviewed several months ago. The 1.2 version looks identical except that it has a 3.5mm stereo headphone jack up top, and that means you don't have to use mini USB for music.
Other improvements include the addition of Swype keyboard input and you get an 8 gig microSD card with the phone rather than a 4 gig card.
Here's our video review of the revised myTouch 3G. it includes a comparison with the first edition and the Nexus One.
-------------------- Lisa Gade Editor in Chief, MobileTechReview
Android Video Review: MyTouch 3G 1.2 Updated Edition