ABR viewer is a great free open source program that allows you to view .abr photoshop brush files without having to install them, its a great way to install only the ones you need and want.

i currently use this when i submit brushes on Qbrushes.com, because obviously after installing brushes before i submit each day and having at least 5 brushes per set on average , your brushes drop down gets way overloaded. so its a very convenient program to have.

get this great program from abrviewer.sourceforge.net Enjoy.