The official site/store for "Land of Og", a funny role-playing game with an interesting mechanic: players may only communicate with a small vocabulary of 'caveman' words.
Pretty interesting attempt to preserve the best aspects of pen and paper rpgs within a software interface. Haven't personally tried it out, but it looks promising.
This page covers various attempts to describe RPGs in general terms. Rather than telling 你 how to roleplay, this is a collection of 文章 on what the different ways are -- and the pros and cons of different choices.
Free software for simulating 桌上, 桌面 RPGs online. Great for gamers who are unable to gather with others on a regular basis due to time 或者 distance constraints.