They've done it!
Here's the Amp Hour podcast -- just a week or two old, at $26.14 per episode from 20 supporters.
http://www.patreon.com/TheAmpHourAnd here's Dave's EEVBlog -- a couple months old at $894.42 per month from 214 supporters.
http://www.patreon.com/eevblogNote that the official number can be high if credit cards expire or are denied, or (for the Amp Hour that bills by episode) if people cap their monthly donation below 4x the per-episode donation, but for relatively new accounts like this, this is a great start! Oh, and people CAN put in ridiculously high pledges and the cancel before billing at the end of the month -- I don't think that's the case with the numbers now, but if the Amp Hour suddenly jumps to $20,026.14 per episode, a bit of skepticism may be warranted.
On the EEVBlog patreon page, Dave says that a $50 per month donation covers 1/10 his bandwidth costs, so we've got that covered and more (although I have no sense of how much patreon might have cannibalized donations via other platforms, but $894 is a pretty decent buffer).
Thanks Dave and Chris for supporting my (and others) preferred donation platform!