I *typically* find crappie deep in the Summer/Winter, and shallow(er) in the Spring/Fall. When fishing deeper, I try to get on top of the fish (boat/dock) and drop my line straight down. When doing this in the winter, I try not to impart any action/movement because the fish are lethargic (some anglers describe this by saying they have a "small strike zone;" in other words, they don't want to chase anything down). I ALWAYS use something with scent during these times (crappie nibbles, scented soft plastics, etc). You can also get on top of the fish by using a slip cork (a good thread about this is currently bouncing around near the top of the forum). In the Spring/Fall, I fish water 0-10ft, mostly by casting jigs. I like curly tail jigs, or marabou (feather) Roadrunners during these times because they impart more action. The noise/movement gets their attention, and in the Spring/Fall, they're not shy about chasing 'em down.
Jeremiah 16:16a "But now I will send for many fishermen," declares the Lord, "and they will catch them."