Tracker which I have designed as a replacement for Gnome's Medusa is coming along nicely (about half complete). Once complete it should make it easier to provide support for things like VFolders for GnomeVFS as well as a generic metadata store for all files/apps and especially Nautilus.
Tracker implements the File Metadata spec which I designed to cover all the basic metadata needs. I am hopeful I will soon be able to leapfrog both OS/X spotlight and Vista in this department with support for fist class documents too (emails, conversations etc).
FOAF updates: Trust rankings are now exported, making the data available to other users and websites. An external FOAF URI has been added, allowing users to link to an additional FOAF file.
Keep up with the latest Advogato features by reading the Advogato status blog.
If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!