Earlier this week, I accepted the one funded offer that I received as a result of my grad school applications, and as of tonight, I have declined my offers of admission from the four other schools that admitted (but did not fund) me, and withdrawn my applications from the two schools I hadn't yet heard from. I of course did not need to communicate with the two programs that rejected me.
One of the four schools that admitted me informed me I would not receive funding. One had me on a waitlist for funding. Two had not said anything one way or the other. It's possible that I might have received an offer, especially after April 15, but now we'll never know.
So, I guess that's all done with.