checkout this link:
right hand side, these are the same people who came up with the "J1772 to NEMA 14-50 adapter box".
on the right hand side of the page, they show some screenshots of an adapter board they are making, for controlling J1772 pilot signals.. looks like it will control the relay, and allow adjustment for the max current, and has an LCD display. This would be easy to add in your own cabling/wiring, and your own J-1772 Male adapter, and you could "make" your own EVSE. Of course it won't be UL listed, but I'm guessing that won't matter to the DIY EV'r. I'm sure the cost on this will be low as well..
Just an FYI, please don't flame me, yes I know it's not UL listed, and you could certainly manage to kill yourself, if you don't know what your doing. This is for experience people with an electrical background.
P.S. this might come in handy, if there is no tax credit in 2011, an also for us folks in the 36 non-initial roll out states, we have plenty of time to make our own EVSE's