Try Relay: the free SMS and picture text app for iPhone.
Recently came across this little gem...such a fun and cute idea. Although, do we really want to meet up in real life? Not sure...
But you should definitely take a look-see at the blogger behind the map at Latte Love and say hi from The Blog Guidebook gals!
The Blog Guidebook has TONS of great tutorials and resources available for bloggers who are looking to spice up their blogs! Seriously...if I haven't linked to anything you've found helpful yet...check THIS one out for sure!!