Videolectures.net is a company that has taken on the job of videotaping and packaging conference talks. They're based out of Slovenia, and offer a good service: they take your talk and your slides, and sync up the talk video and slides so someone watching later on can follow along.
For examples, you can see my talk at ETVC, and here are the other talks. I first heard about this company when I was googling a paper and discovered that the ICML talk was online.
I originally thought that they only handle events in Europe, but they appear to have covered this year's KDD as well (although the coverage appears strangely limited).