This is an excellent site for icons!
You can download most packs/singles as either large 256x256 .PNGs for THUMBNAIL Layout on folders, or the .ICO for the other views for folders and apps.
Heres a screen of a set I got, I got the PNGs and the same icos for the different views, and now its really nice and organized:
http://www.iconarchive.com/
Tons of categories, tons of packs.
You can download most packs/singles as either large 256x256 .PNGs for THUMBNAIL Layout on folders, or the .ICO for the other views for folders and apps.
Heres a screen of a set I got, I got the PNGs and the same icos for the different views, and now its really nice and organized:
http://www.iconarchive.com/
Tons of categories, tons of packs.