I'd agree with this, and even take it a bit farther. Many of the graduate level courses have lecture notes online and these can often give insight into current research. Here's a page with links to EE/CS courses: http://inst.eecs.berkeley.edu/classes-eecs.html

Another thing to watch for, besides talks specifically open to the public, is lecture series taken for credit, such as {EE,CS}{198,298} in the above page. I took EE298.2 last semester for example, a communications/networking/DSP seminar, which had visiting scholars presenting their current research at almost every meeting. Nobody would have cared or probably even noticed if a random person showed up to listen.

Also see:

http://video.google.com/videosearch?q=google+techtalks

Yeah the tech talks are awesome. The Museum of Computer History has some great lectures on tech talks. One that I particularly like is titled "Great Principles of Computing". It's a nice summary of the past few decades of computing principles. Here's the link: http://video.google.ca/videoplay?docid=5494452304620274339