Filed under, "Why didn't we think of this?" are TravelStacks, ($19) eminently useful three-tiered containers that fit into car cupholders. Use 'em to store lunches, change, keys, parking tickets, or whatever else is currently clogging up your glove box that you use on a daily basis. The containers are detachable, so you can use 1 at a time, or all 3, or buy 2 sets and stack 'em high.
See more travel organizers.