A friend shared this recipe. Tried it this weekend and loved it.
Give it a go:

-Sliced or chopped mango (2)
-Sliced or chopped green apples (2 or 3)
-Cherry tomatoes (1 pint)
-Red onion, thinly sliced (about 1/2 small to medium)
-Cilantro (tons of it)

Dress with a mix of lime juice (a lot), olive oil, a tiny bit of rice or wine vinegar, and sea salt.

Update 8/18/09

I made it with grapes instead of mango.  Still amazing! It’s the oil-sweet-salt combo that works so well.