for sharding, multi-master, backup connections, etc. Probably will take a
Horde_Db_ConnectionManager object or some such, that can implement logic for
which connection to use.
+
+- interface for doing tag searches via technorati, google, etc. (take a tag in
+ the system, find things with the same tag on other systems).
+
+- linkbacks addition: instead of just tracking linkbacks we're directly notified
+ of, also provide a way to search for links to the resource in question (google
+ link: search, etc).