Great feedback, everyone! Keep 'em coming.
The Ralph Kimball links look great. For the moment, lack of time has kept me from doing much more than give them a quick skim (if that). They do look like great material, and I'll definitely set some time aside to absorb them some more.
I confess that I'm not much more than a novice myself, so I'm trying to learn what I can about DWs and BI. My line of thinking about doing a presentation -- "DW for Dummies" is my working title -- is not just to educate other people, but also to educate myself as well. If there's one thing I've learned professionally, it's that one of the best ways to learn about a subject is to write about it -- or in this case, present about it.
I think Steve pretty much hit on it when he suggested keeping it high-level; that was pretty much the approach I was thinking, anyway. I haven't yet reached the level of expertise where I feel like I can get granular with DW/BI topics, but I do feel like I'd be able to at least provide an overview from 30,000 feet.