I like basic veggies/fruits for snacks - apples and grapes, carrots and celery, those types of things.

I'm not sure this qualifies as a snack, but something to try (and maybe someone else already wrote this):

Take some fat-free cool whip and put it in a bowl. Microwave it (I do it on high for about 12-13 seconds, any more than that and it's gonna be a little grimy). Then take it out, should be nice and gooey... stir some protein powder into it and you've got some delicious pudding.

Mmm... I wanna go have some now.