I've never had much interest in correspondence chess. Way too slow for me. I prefer OTB action, the bang on clocks, the nervousness and, from time to time, the excitement of travel. On the other hand, there are chessers out there who consider correspondence the truest kind of chess. Maybe it's all that extra time they have to think and consider their moves.
The Chess Maniac argues for correspondence chess for the following trio of reasons: quality, expense and friendship. And here are his 10 steps for playing correspondence chess.