Having returned to RPGs about two years ago I have seen references to play-by-email, play-by-post, and gaming using something like skype and some form of online visual aids be they virtual table tops or just shared online whiteboards.
I played in Scott Driver's short Thool Tunnels & Trolls play-by-post game. I enjoyed seeing how it worked and getting a chance to see Scott's world but I found the pace to be frustrating.
The forums at Troll Lord Games seems to have a community that is very active at using skype and I saw that Jim LotFP has ran a few sessions using skype as well. I have never participated in a skype game.
What are peoples' opinions? Have you used skype for gaming? Any issues? What are the good online aids? Are there any skype-like applications that use webcams?