It's been a long time since I didn't write a single word here - lack of time unfortunately.
If you are an ASP.NET programmer and want to write a Facebook application, you can start by taking a look at Facebook Developer Toolkit. I'll tell you from start that it's not easy, I pull the hair out of my head trying to do some very simple things (at first sight).
Toolkit it's pretty useful, far from being perfect, but at least there is something. Long and short is that I finally find some time to finish the project of writing a version of Ysabel for Facebook! You can play it here.