i've been tossing the idea of a scooter or motorcycle around for summer commuting for a while as well. i've never driven anything with 2 wheels before so i'd like to get something that i wouldn't be torn up about laying down on occasion while learning. this is a good thread to read as i've wondered a lot about this and read a lot of good things to consider as well.
i don't know anything about how they run or ride but there is a set of Honda CB360s for sale locally to me for $300, one running and a parts bike. thinking of picking them up, not much investment if i decided to ditch them later. they are cool and old school looking (which i like):
or i would love to get a little Dnepr with the side car for the dog!