Scott Hanselman has a write up on the Grok Talks at Tech Ed this year. You can read it over
here. The basic idea is to distill down the best of a long presentation into something that you can "grok". It reminds me of what a high school teacher of mine used to say about tests. "They should be like mini-skirts, long enough to conver the subject but short enough to keep them interesting". There will be several talks during the break out sessions so if you have a few minutes and want to drop by to see what these are all about and how much fun it will be to "grok" a topic or two.