Which interesting machine learning summer schools are out there?

Machine Learning Summer Schools change always, different organizers have different schools.

Usually is more about who do you want to talk to than the overall school itself. Almost all of the Machine Learning SS have their lectures posted online in videolectures.net. I personally recommend you to check the 2009 Cambride MLSS, that one had the likes of Michael Jordan, Zoubin Ghahramani, Yee Why Teh and Bishop (like in the book).

This year there are three MLSS I'm aware of. And it all depends on your budget and again, on the people you want to meet.

Singapore MLSS: It's going to be held in Singapore National University on June 10-17 (I'm going to this one). Ghahramani, Teh and Wee Sun Lee are among the speakers at this one. In my opinion this is the most academic one.

INRIA, Bourdeoux, France: Good if you are in Europe, for what I saw the speakers are mostly european and also really good.

Purdue University, Indiana: Mostly American, mostly Purdue Prof. and some from the Industry (Microsoft and Yahoo)

In this site they usually upload the main MLSS in the year. There is also a couple of Summer Schools of Vision and Machine Learning and Cognitive Sciences, but I'm not really well informed about them.

Word of advise, I think most of them closed registrations already, only the one in Singapore is still accepting candidates, but the scholarship process is over now.

UPDATE: They just extended the deadline for a Vision and Machine Learning Summer School here