T-Mobile 1900MHz Locations

Ya know that T-Mobile has been repurposing its old EDGE frequencies to allows HSPA (i.e., fast access to the inter-tubes), right?

And that this means that in some areas, you can get on T-Mobile at 1900MHz, right?

Instead of needing to do it at 1700MHz, right?
(that last bit is important - it means you can use most "world-phones" instead of "T-Mobile only" phones)

Herewith a handy-dandy map showing you where people have been spotting the repurposing.  The short version? In a bunch-a places, but not everywhere...)