Organise Fonts for Design Work

So I'm doing some commercial work and have a whole load of fonts that I've either bought or have permission to use commercially mixed in with a whole bunch of fonts that I have just downloaded for personal use.

I'm using Adobe CS5, and across all programs am looking for a way to organise these fonts into "Commercial" and "Personal" files so that I don't have to keep checking my references to find out where I've got them from. Like anyone in design I have thousands of fonts installed so it certainly gets a bit tedious!

Any ideas?

A.

Resolved!

Thanks for your advice. I've actually gone a different route though:

Using the FontBook application already on my Mac, I've created a new "Collection" called PERSONAL, dragged everything that is not for commercial use into this collection and then disabled this collection temporarily while working on my projects.

Doneskies.