The navigation sub-menu entry for Xfmedia, when browsing the different projects (ie on this page, http://www.xfce.org/projects/mousepad/), points to http://www.xfce.org/projects/xfmedia/ but that brings up a page-not-found error. So, either the page http://www.xfce.org/projects/xfmedia/ needs to be created or the link in the menu needs to be updated to something like http://spuriousinterrupt.org/projects/xfmedia/ which is the link used on this page http://www.xfce.org/projects/.
Nick, it should be http://spuriousinterrupt.org/projects/xfmedia - no trailing slash. It's a file, not a directory.
Should be fixed when the servers are synced.