The masterplan
PHPture is an interesting plug in for Aperture which, if I understand correctly, uses a web server on your Mac and the PHP language to run a web site which looks like Aperture. It accesses Aperture's database and shows stacks, thumbnails, and a project listing, and makes your image versions available over a network or via the web.
Don't worry if you don't have Aperture or a Mac - once things settle down, it won't be long before such a thing is practical for Lightroom. It's possible already.
Via Micah Walter's Aperture Plugged In.