Hi!
I just came across an interesting article in a german PC-Mag, covering use
of universal B-trees for indexing multi-index databases. Looks VERY
promising, indeed.
I dunno if that could be implemented in postgreSQL, or is of any interest
at all, but here's an URL for anyone ineterested: http://mistral.in.tum.de
They have set up a nice web page showing the ins and outs of the
algorithms, and nice presentations.
As a plus, the results they had seem VERY good...
Greetings,
Joerg