If you're anything like me, you probably haven't played CS since the days of dialup, but something like this I could definitely get into:

http://www.gamershell.com/download_17652.shtml

It's Counter Strike except in 2D with an overhead view. It basically controls the same as the traditional CS and with all the sound effects included, it certainly brings back some memories of what was probably the first online FPS I really got into.

It will be interesting to see what everyone thinks - on the topic does anyone still play CS regularly?