How about a lesson on how to use an RSS reader? i think it's just as important as Rikaichan in learning Japanese, particularly with regard to japanesepod. With learners understanding how to use an RSS reader like bloglines.com I think a lot more people would contribute in the messageboard/forum.
Just the other day someone mentioned in koreanclass101.com that they were disappointed that every time they checked in on the site there wasn't a new lesson. I was amazed that not everyone was using RSS to keep up to date on what was happening, and some people were typing the url in the browser, and repeatedly going to the site. I of course put a post on that lesson but the person didn't get to read it, which is kinda my point...