Wow, I didn't realize that was an EP original. Very cool.
We missed our chance to get an EP original on the Hugo ballot, TAD! Bummer...
Off hand, I can't think of any other stories on EP that went on to be published in collections, although I know some stories (like Tim Pratt's "Impossible Dreams") are in collections, they just weren't EP originals. I could be wrong, though, and I know Pseudopod has a couple (I'm thinking mostly of Matt Wallace).