Looks like MySQL gets MemCached UDF's (user defined functions).

This was mentioned by Patrick Galbraith on the MemCached mailing lit yesterday. This is amazing news, as this will allow you to update or invalidate cache entries from within MySQL using a trigger. This reduces the complexities of cache invalidations by a huge extent. Its unclear if this is part of the MemCached project or a separate project.

Can't wait!