I have seen quite a few conferences post video tutorials (eg http://bioinformatics.ca/workshops/2011/course-content). Companies like Illumina have some webcasts as well (http://www.illumina.com/events/webinars.ilmn). I think AAAS also does such webinars and keeps them online.
And here is a 'course videos online' biostar (http://www.biostars.org/post/show/10766/what-are-the-best-bioinformatics-course-materials-and-videos-available-online/), but am more interested in webinar/talks etc
But they are hard to find when needed :) .. do people have collection or resources with such videos or webinars? Perhaps some of you have a few bookmarks to share here!