PHPture: Aperture on the web
PHPture is very cool, and almost makes me wish I used Aperture to organize my photos. PHPture leverages the web technologies that are baked into every Mac running OS X to enable sharing of your Aperture library over the web. PHPture is limited to serving up webpages from the Mac that has Aperture installed on it by default, but I don't see why you can't serve up PHPture from a remote server that has access to your Aperture library.
PHPture is open source, requires PHP 5 (which isn't included with OS X) and has been tested on OS X 10.4.9.
Thanks, Nik.