This Dremel accessory guide is great for when you have a Dremel and don't know what each tool is used for. Or maybe you have a project and you want to know the right accessory to buy. This chart will come in handy.
it's a Truc Clean, simple and portable. I'd go for a self build option if they'd only make one, and given that this is by far the most popular thing I've ever posted, it seems I wouldn't be the their only customer!