Tabletop, with what very little experience I have with it, is definitely fun. I also got involved in a fantasy-themed PHP-based real-time roleplaying game called Hollow several years ago and that was quite amusing for a while. You'd click 'refresh' and see all the people coming and going in text-based format; basically a lot like the DOS-looking ones, but with a shinier interface.
"What kind of RPGs do you prefer?"
Technically, JRPGs from around 1992 through 2006 gets my vote, but I know that's not what you mean.