Ummm I have CS2 and when I downloaded brushes made in photoshop 7 and put them in /extensions/brushes they never showed up on my brushes pallet. I've installed many from different PS version and none show up.. What am I doing wrong!?!

You need to right click on the canvas while equipped with the brush weapon and select the (>) icon and click 'Load Brushes' before they will appear in your inventory.

Figured it out, but you are a great help

Thanks man!