HTC's HD2 is the hottest piece of WinMo of the moment, and ever since it got the nod for an (unofficial) update to Windows Phone 7 it's been looking all the more tasty. Now it's getting more affordable too -- if you happen to have an iPhone you're willing to give up. T-Mobile appears to be running a promotion at certain locations through May 19 that would give between $100 and $350 off of a new HD2 for anyone trading in a working handset. Frankly we don't figure too many dedicated iPhoners will be taking this opportunity to ho
