Online machine learning tutorial Does anyone know some good tutorials on online machine learning technics?
I.e. how it can be used in real-time environments, what are key differences compared to normal machine learning methods etc.

UPD: Thank you everyone for answers, by "online" I mean methods which can be trained in a real-time mode, based on a new inputs one by one.
There is a very nice library of online machine learning algorithms from a group at NTU, called LIBOL. This would be a very good place to start experimenting with the algorithms.
The accompanying user guide, and associated JMLR publication are very nice introductions to the basic algorithms in this field.  
Avrim Blum has an older and more technical survey paper on online learning algorithms.