Attached Link: http://market.renderosity.com/softgood.ez?Who=hogwarden

Could be worth checking out PBooost... I wrote it to help organise your library structure and avoid the 255-folder-in-a-library bog limit.

Basically, PBooost lets you split each library (pose, character etc) into a series of 'banks' which can be switched in and out of Poser. So you can have a pose bank for Vicky MATs, a pose bank for Mike Characters etc.
In the image, I only have 2 banks... the default bank and one imaginatively called 'new bank'. I'm just about to start organising the library.

Of course, you can move stuff around between folders and banks, re-name anything to whatever you want, etc.

PBooost 1.3 is for Poser 4 only, but 1.4 is very nearly ready. It's fully Poser 5 compatible and has loads of seriously useful features. The update from 1.3 to 1.4 will be free.

If you need any more info on PBooost or have any questions, please feel free to mail me at h@horseless-headsmen.co.uk or IM me here... or even post in the forum!

Hope this helps!

Howard:)