Just got a note from a friend who works on RevolutionHealth . This is a local startup run by Steve Case.

Anyhow, the interesting bit is that it's all in Rails. They're doing some nifty AJAXy stuff on the front end; if you get an account and edit the profile info you can see that it's all done inline with divs and whatnot. Very slick.

Now, what I'd be more interested in is backend info. Are they using Mongrel? PostgreSQL? Pound or Pen? Maybe they'll do a presentation on it somewhere... like at NovaRUG! That would definitely be one worth attending.