I couldn't let this chance pass by of course (the bundle is only available for nine more days), so I'm now the proud owner of Splice, Eufloria, Waking Mars, Crayon Physics Deluxe, Superbrothers: Sword & Sworcery and of course Machinarium!
I bought them all two days ago, and I've already finished Machinarium. It was a wonderful game. Really hard puzzles, beautiful art and a great storyline.
I only played Crayon Physics and Eufloria for a couple of minutes, but it's clear they're both quite ingenious games as well. And another great thing: the games in this Humble Bundle are all playable on Android!
The average price is $6.17 at the moment, so I really can't think of a reason for you not to go play all these games! Even if only for Machinarium.