Since I know people like good deals and like to support indie game developers here, I thought I'd bring this to everyone's attention.
The current bundle:
A.R.E.S. Extinction Agenda
BONUS DLC OFFER: For every 10,000 bundles sold, a single DLC for Sanctum will be made available in all bundles.
From the FAQ:
What is Indie Royale?
Indie Royale is an indie game bundle website that offers up four top-quality indie titles every two weeks for you to purchase at seriously silly prices. All you need to do is pay the price stated - or pay more - and the four games currently featured will be yours to keep forever.
The website has been set up by the creators of leading independent video game editorial site IndieGames.com and the makers of notable online download service Desura as a joint venture. We know our indie games (a little too much, some might say) and we know the games that are worth playing.
The point of Indie Royale is to put the spotlight on those indie titles which provide fantastic experiences, but may well have been passed over by a good portion of the mainstream gaming public. If you purchase an Indie Royale bundle, you can be safe in the knowledge that you're not only getting four brilliant indie games - you're also supporting worthwhile developers.
How long do bundles run for, and how often do new bundles appear?
Indie Royale bundles run every two weeks, and run for a period of five days each. A resting period of nine days is taken in between each bundle.
Why does the price of the bundle keep changing?
As people buy the bundle, the minimum price for the bundle rises, and you'll have to pay over this amount if you want to purchase a bundle of your own. However, people can also pay over the minimum amount to knock the price down (see the question above for details on that). Hence, the current price will keep changing as the week goes on!
Steam, Desura, Windows, Mac, Linux. Why do all the games have different versions available to download?
As part of the Indie Royale service, we try to offer as many different versions of each game as possible. If a game has Mac and Linux versions available alongside the Windows versions, we will make sure to offer these as part of your bundle. The majority of bundled games will also be available via the Desura digital distribution platform, so that you can keep all of your games together in one place - a Desura key will be provided in these cases so that you can activate your games via Desura. Finally, if any games are available via the Steam digital distribution service, you will also be provided with Steam keys to activate your games via Steam.
I haven't played half of the current bundle, but it's well worth it for Sanctum alone. Great FPS/Tower Defense hybrid (that recently got a big update with lots of new stuff).