Okay, new update.
2 new bundle sites going on the list!
Green Light Bundle - A bunch of games aiming at being released on Steam, this bundle helps games get their limelight (some of which are already on Desura) Once the games are released, you get your Steam key & in the meantime you can download them all DRM-Free.
Solidarity Pack - A bundle a games by Spanish Developers, all games (bar one I think) can be installed in English, really great way to support developers from across seas!
I was checking the list last night and it seems some of the links are now dead, though I've had issues with my internet browser this past week so it could be me. I'll keep them up until I know for certain they're dead (that's not to say they won't return)
This is a favourite article of mine and I WILL continue to update it.
Please let me know below if some of the links don't make it to their homepages for you either.