Michel Chevallier from the Geneva State Chancellery emailed me a press release announcing that without any special registration 22,000 Geneva citizens will be able to vote from anywhere online in six referenda on September 26th.
Personally I don't think technology is ready for such matters but Michel and the team in Geneva very strongly feel that e-voting is the way of the future, especially with the preponderance of votes Swiss citizens encounter in their civic lives. The Geneva election is probably a world first as it uses only the standard voting credential citizens receive no matter which channel they use to vote.
The system is merely an SSL-based website, so how security and anonyminity are delivered is unclear. I've put the original PDF press release on this site as I can't find it anywhere else.