More game sources
There are some very interesting games listed on Mod DB. Use the ">>" at the top by the tabs to choose tabs (filters really), particularly Linux, Linux64, Flash, and Web.
Note that most of the games are still in development (TBD at the top by the name and logo), but many are already released. I think it would be a good idea to keep an eye on those, listing some of the better ones available, and waiting for the others to be released.
Here's a couple I've found recently: