Well, here's the list so far... I'm fairly confident all these games are possible, just that some will involve larger chunks of code and lots of tables.
If you want to know more about a particular game, then search the web - I'd imagine the rules for most of them can be found somewhere.
If you have any other suggestions you'd like to see on this list, mail us at firstname.lastname@example.org
Games are distributed under the WebGames License