I haven't heard about Curve specific GPS application stuff like for the iPhone (MapMyRide has an iphone app that i hear works okay). But..maybe it does have something like that for free like iPhone does. ???
I picked up my 705 from CompUPlus for a little under $400 last year (the HR monitor version)...and then later got the street maps for $100 from Garmin.
Those puppies don't have to cost you an arm and a leg.. (though $500's bad enough, I guess! just not as bad as it could have been)
2009 Giant Avail Advanced 1
2008 Trek FX 7.5 (Commuter)
Baby Blue..retired to new rider: 2006 Giant OCR-C