Doh. C3 is in the wrong place. :-( It's connected to the Vcap pin in order to stabilize the internal voltage regulator on the DS33. It should be as close to the Vcap pin as possible. It's miles away! I'll have to move it. Luckily, no etching yet; I decided to sleep on it instead of sending it to the board house last night... As for the DiY etching, I don't like my chances of lining up the bottom layer; I'll give it a go anyway. :-) Everything else looks fine. :-D