My favorite hobbies
The game of Go
Fédération Française de Go everything you ever wanted to know about Go in France;
Sensei's Library: a Wiki site that has become the most useful FAQ about Go;
Gobase: a seemingly infinite source of information (players, articles, SGF games, etc...);
The usenet forum about Go: some noise, but also plenty of informations;
The Go club of Boulogne Billancourt: where I used to play each and every week.
BlackJack
Everybody know wants to play Hold'em, but...
Blackjack Review Network: an excellent page with very good thematic forums;
BJMath.com: blackjack, maths and forums, what can you ask for more?
Gambling Book Reviews: very good book reviews, with among others BJ books;
The Gamemaster: an easily accessible page with lessons.
Danse
I enjoy a lot dancing (and listening to) Cuban Salsa
Fiesta Cubana.net is the (French) reference forum;
Ivan Martinez is a very talented teacher;
My Salsa wishlist to get on Amazon or not.
Argentin Tango is now rather a nice souvenir...
Mephisto Tango: an association providing high quality classes;
Tango-L: the authoritative mailing-list about Argentine Tango;
Tango Store: Zivals' store in Argentina, to get your CDs at the best price.
Others
My daily Dilbert;
Squash Site: the world reference for squash-related news;
Le Mouv': was my favorite radio when I stopped listening to OUï FM since it had so many ads. Now I actually rather listen to Timba Para Siempre;
PilotGOne: an SGF editor for PalmOS, which I was co-maintaining. You can also find here a Renju version, that has a simple no capture patch, and 15x15 as default size [thanks to Enrico Viero];