This is beyond question the largest supply of free icons ever published in one article. With this exceedingly massive supply, your icon solutions for websites and Apps are pretty much endless! Ranging from file types to gadgets, Mac icons to Firefox orbs, RSS feeds and even race cars. Yes, even race cars.
And all of them are free. Plus, the the benefit for you is that they have all been carefully (and tediously) organized. Each set contains only the largest size available for it's particular icon (so we don't have 10 different duplicates for every size) and is labeled with the package name & a link to the author's site where you can check out more of their work.
One final note: each of these icons are in .jpg format. Which means that if you are using them against white backgrounds they'll do fine, however if you want the uncompressed PNG's in their original transparent form, please visit the author's website listed for each set.
Shining Z by vistaicons
Rounder by Vicing
Vista Style by vistaicons
Joost TV by iTweak
iMovie 08 by iTweak
Compass by iTweak
Feeds by Nyssaj Brown
Social Icons by Freak Group
Social Web Buttons by www.webfruits.it
Camino by Flarup
Square Compass by Jet Stream
Knobs by iTweak
Internet Tubes! by PixelResort.com
To disperse the load not all of them are on one page. Click the below links to view thousands more: