NerdBusiness has created quite the link bait post which I have fallen for which contains 5,798 high quality icons for use on the web, within applications or RSS. This is by far, one of the biggest, most organized icon posts I have seen to date. All of the icons within this post are free. However, all of the icons listed within this article are the largest size within the pack and are of .jpg format. That means that if you use the jpg image on a white background, it will probably look ok. But if you want to use these icons on a different colored background, make sure you visit the authors home page and download the respective .PNG icons.
Thoughts and Insanity From Jeff 
Thanks Jeffro, it will be very useful ;-)
Very nice! This is what I love! Good work! How do you find these?
@Utahcon Through the magic powers of RSS :)
Amazing find there (and I’m not only talking about me discovering your blog), but just to make sure, what’s the Legalese on this matter – in general, not just in relation to this particular set?
Does “free” automatically mean “available for use on commercial websites” (i.e. websites with revenues – not ones made from the icons, though)? Or is it simply no-strings-attached-knock-yourselves-out?
@Niclas The safest thing for you to do is to visit the icon pack authors website of the pack you want to use and check out if that person has placed any restrictions, Just because someone organized icons packs and says they are free for use, doesn’t necessarily mean you can do whatever you want with them. Always go back to the source :P