Hey Darcy, the forums are looking good!
I love my wasabi Monolith dearly, and I do think it is definitely the best sleeve solution for the Powerbook 17. (I would defintely have bought one if I hadn't won mine!)
Now, I probably will never need a full sized bag for day to day use (even a small backpack would be more bulky than it would be worth), but I would love to have something to hold maybe the power adapter, a few CDs, and miscelany. What I would love is a sleeve almost identical in construction (but with less padding and more interior space) that could strap onto (and be carried in tandem with) the Monolith or Brain Cell. That way, the bulk of the total package would only be increased in one dimension! Ideally, the sleeve would have a plastic insert that would act like a drawer, maybe with repositionable dividers. That way, people could customize the insert to fit the stuff they have without it sliding around too much.
Am I making sense? I can never tell. ;)