Rocky, I can't wait either. :) Where's the best place to find you after the show? You can PM me, FB me, or leave it here in Coffeehouse, I'll find it.
Aww, DQ, I wish you lived closer so we could meet you.
Tiki, I haven't tried this yet but one thing I was considering as a divider was a piece of foam or filter media like this:
If you sandwhiched it between two plastic canvas sheets, you could also use the less stiff type like this:
Bear in mind that your flow will go down to almost zero so you might want to pick up airpump-driven filters like the Tetra Whisper 3i or Lee's Corner Box filters and put one in each section. If you don't filter each individual compartment, your water will get horribly stagnant and gross. Trust me on this.
Bristlenose plecos can go in 20gals.