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Brilliant! Looks like exactly what I need. A bit more background on the project. We're trying to set up a remix portal for a university environment. So I will end up spiking the site with initial tracks and loops, but then students/staff will (hopefully) download the loops, create remixes, then upload them to the site where people can listen, rate, rank, etc.
So far the other contenders were TikiWiki (as I'm partial to wikis, but TikiWiki doesn't seem very stable, and for this site we really don't need wiki-esque behavior), Plone (although again not a fit), or use a canned php script(s) with a traditional static site. I looked at phpnuke but have been scared by the security (or lack thereof). Seems like XOOPS has a big enough community to keep things going, and a nice clean design. The admin menus don't work right with Safari though (have to use Camino).