From the onset of the MPG Challenge on Friday to the conversion of Wisconsin Power's stock Toyota Prius to a plug-in hybrid on Sunday, HybridFest 2007 was the most rockin' party for treehuggers, hypermilers and other greenfolk this side of the Atlantic. If you feel bad that you didn't make it, you should. But to take the edge off, I'm here to tell you about it – as long as you promise to make it next year.

First of all, keep your eyes peeled here at AutoblogGreen, because we'll have interviews from happy hybrid owners, hypermilers (including those that competed in the MPG Challenge), and other attendees of various shades of green. You'll also find out how to get much better fuel economy that the EPA estimates, as long as you're okay with being tailgated. We'll also have a video of my sample attempt of the MPG Challenge in a Toyota Highlander Hybrid – it wasn't pretty.

Last year, HybridFest visitors endured the heat outside, but this year the event was in the air-conditioned comfort of the Exhibition Hall of the Dane County Fairgrounds, and was reportedly bigger and better than last year. Count on that being the theme of next year's Fest as well. Attendees were able to view exhibits from major automakers and their green offerings, alternative fuel promoters, green product manufacturers, and even a vintage Aston Martin V8 Vantage running on E85 (see gallery). I don't agree with the fuzzy seat covers, but to each their own. I'll see you there again next year!

Gallery: 1967 Aston Martin DB6 w/ E85 Conversion