I clicked on their coverage tool today and saw that they added a little java to the map. Coverage data looks the same though.
I just tried it and it looks like they are using an older set of maps. I plugged in zip code 11030 and where it says "Munsey Park" there should be a dark green spot which is the T-Mobile site in my church. This is how the map used to look: The site is still active so I guess their maps are wrong.
The maps finally were updated late last year to show the little bit of coverage in my town. The range of the coverage has been changed several times, often too conservative, sometimes too liberal. They still haven't shown the new tower in Dover (on a Nextel tower...cough cough no Sprint there though).