My friend and I use both cast and seine nets. If you are out jsut looking for cool stuff to catch you cant beat a seine net because you tend to catch a better variety of species. Our favorite fish to catch are darters. We find a nicely flowing clear stream and one of us takes our 6foot seine and step on each bottom corners with our legs spread as wide as we can go and hold the poles. Meanwhile the other is upstream kicking rocks and creating all kinds of ruckus as he walks back downstream towards the net. Once everything is said and done we catch all kinds of beautiful darters, sculpins, minnows, and even hellgramites that make awesome bait for small mouth!
One time we caught a banded water snake and a bunch of minnows at the same time and this is no lie, while in the net the snake started eating the minnows!