Study hard. There are many many digital cameras on the market. It all depends on what you are going to use it for, how much you have to spend, and how much hard drive space you have left on your computer.This site might help you out.
http://www.dpreview.com/
Here are a few pictures I took with my Olympus 2100 Ultra zoom camera at the Toledo airshow last month.
http://www.pbase.com/dogdirt/toledo_air_show_2002