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"The Humble Indie Bundle" includes the well-known* and highly rated "World of Goo" as well as four other indie games: Aquaria, Gish, Lugaru HD and Penumbra Overture.

This video explains everything:

I'm going to buy the games right now before the euro falls an further.

Update: After you pay, you can download DRM-free versions of the games for Windows, Mac OS X and Linux!

Here's what you'd currently have to pay for "World of Goo" (PC version) on Amazon:

* Which means "even I have heard about it". I'm sure the other games are awesome, too.