I neglected posting here (being rather blogged out last night), and quite possible everybody who reads this has already seen it mentioned on twitter or google+ or my blog or Emily’s blog or… etc. But just in case:
I have just released a textual bagatelle for iPad (and iPad 2, but not iPhone yet). It’s not a game. It’s a sort of generator of IF-like room descriptions, though. I hope you find it fun to play with.
Aw…no PC version? Sounds pretty cool though; could we have a demonstration of its output or somesuch?
If you search Google for the game’s name, you should get a number of reviews of it that contain some samples.
-Kevin
A googol different outputs? Okay, but how many bits of entropy? 
Almost exactly ten bits per leaf. (Not counting the root, which is fixed and only contributes 2.5 bits.) Maximum of 40 leaves, so about 2^390 (10^117) distinct possible trees.
Good question, though. That “googol” figure was counting generatable possibilities of the text engine. It’s a coincidence that the number of possible trees is a few orders of magnitude larger. Would have been embarrassing if I’d run through the calculation and found that only 10^80 outputs were truly possible. 