If I'm at work, I tend to snack on Chex Mix. Once in a while I'll buy those 100 Calorie Packs. I'm a fan of all of them.
If I'm at home, I love these:

Korean Dried Seaweed
I usually eat the sheets by themselves, but if I have some leftover sticky rice from the night before, I usually roll em up. The only crappy part is getting all that seaweed on your teeth...but it's oh so good!