This new iphone app, "Trip Journal", seems like it might be a good app to capture chowhounding data while on trips:
Obviously, iphone apps mostly draw off the same database of restaurants, which won't include very new or fuzzy places...or menus, etc. So the perfect app will never be created.
But this strikes me as a better solution than constantly jotting down addresses and phone numbers, and more organized than simply shooting photos. And seems especially good for when you're in an unfamiliar place, but passing lots of interesting-looking places you want to note. Shoot a photo, grab the GPS, scrawl a note, and have it all organized linearly for you (so it's easy to reconstruct later than a pocketful of business cards).