TechTalks.tv is a new service that is designed for publishing slides that are synchronized with videos. Judging from the demonstrations on the site, TechTalks.tv is good for matching video of a live presenter with that presenter's slides. On one side of the screen you can watch the video and on the other side you can view the slides with the same timing that you would have experienced had you been there for the live presentation. You can also fast-forward through the slides if you want to.
Applications for Education
If give a presentation in person and want to share that same content later, TechTalks.tv could be a good service for do that. Often times videos of presenters are heavily focused on slides or heavily on the presenter, but rarely are both captured well. TechTalks.tv could be the solution to that problem.