We have it on good authority that the T-Mobile HTC HD2 smartphone will launch on or around Wednesday, March 24th for $199.  This information comes from a trusted source who is already using the HD2.  We certainly hope it proves true.

The $199 price is, of course, after a two-year service agreement.  Our source did not know the unsubsidized price (though it would likely be in the neighborhood of $500), nor were we told whether $199 is after a mail-in rebate or at checkout. 

The HD2 is one of the most anticipated Windows Mobile smartphones in years, and features a huge 4.3-inch capacitive touchscreen. 

Thanks, K!