Well, it's a "free" (i.e. you can pay for more fancy stuff) text-based web RPG (like Planetarion -or however that's spelt- or sunday league football manager)
You know, the kind of game you can quite happily spend 15minutes a day on.
It's worth a look - basically you choose a class (for cheapskates like me, that's either a Barbarian, Mage or Archer I think) and a race, then go exploring. Though you don't do any "interactive" dungeon crawling, bascially you set a dungeon to explore, the game plays it all out for you (roughly every 7 hours) and you get a lovely text explanation says what happened, what equipment / XP you got and so forth.
If anyone decides to play, I'm currently on "Aberon"
World of Dungeons Link