FYI: DIY PVC CSB
Their system is totally comprehensive and can create just about any light-modifying setup you could possible imagine -- if you have the moolah. But if you are a dirt-broke college puke (or perhaps a former Lehman brothers executive) you may have more time than money at this particular point in your life.
If that is your situation, you might want to take a look at this DIY version of the CSB Micro Mini, which is proving to be popular enough to be in a backorder situation on the accompanying flash mounts.
(And check out "we-knew-him-when-he-wasn't-famous" Bert Stephani starring on the Micro Mini webpage, too...)
Back to the DIY. Thanks to reader John Gibney, if you have a little patience and know your way around a sewing machine you can try out a DIY version to see if all this bouncing stuff is right for you. He gives pretty detailed instructions on his blog -- even how to include a 5/8" stud for mounting a flash or sticking the bounce in an umbrella swivel.
(Thanks much, John!)