Icon Experience
I purchased an icon set for use in software development from Icon Experience around six months ago. This is a great snappy looking Windows XP style icon collection that makes my winforms software look a whole lot better. The reason its being mentioned here is that they just sent me an email indicating that they've added a bunch of new icons and it was available as a free update to existing users of V5 of the icon range. This gave me such a warm and fuzzy feeling (as a customer), that I decided to blog it. Kudos to Icon Experience for depositing in the customer loyalty bank account as opposed to going the "squeeze a bit more $s out" approach.