After talks with a long term client of mine, I'm taking the brave move to open source an eCommerce app built in Rails & Flex that we're building - a replacement of a PHP/MySQL app. I'm currently doing the first cut of the application which I'll make available once it's done (and look at a public svn repository etc then). Which should be about a month away - give or take.
More on the announcement, hows and why's, roadmap etc here http://work.rowanhick.com/2007/07/17/open-source-rails-flex-ecommerce-application/
Cheers
Rowan