Jon has an amazing screencast of a hidden windows search feature. It's existing since 2000, and exposed a little bit in the XP UI.
Metadata in mp3...
@Artist='Beach Boys'
On XP, right-click on the System icon, choose Manage.
Under Services and Applications, there is an Indexing Service entry.
Pour avoir l'indexing sur d'autres champs. Dans le dossier Properties, activer Caching et mettre une taille (128) et Secondary.
IFilter interface
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/indexsrv/html/ixrefint_9sfm.asp
Glop
http://www.3deurope.com/Blog/