Here’s a blank swatch (.aco) file for Adobe Photoshop. I made this with CS5.1, but it should work for any CS version. I just got sick of deleting all those swatches after a reinstall (10 levels of gray!) and figured I’d share.
There’s a bunch of ways to use this. You can just double click on it, which usually works, or you can click on the icon in the top right and go to ‘Preset Manager’ and load it there. Should work for PC or Mac.