May 2015 Update:
231 Micons – Free Icons Set
These outlined icons are well crafted and playful. The consistent style is visible in all 231 icons and are a must-have for your collection.
Vector Gesture Icons
A set of more than 50 free gesture icons designer for multi-purpose devices.
Happycons: 40 Happy and Unique Icons
Happycons is a pack of 40 essential icons designed in a happy and unique manner by Darius Dan. All icons are built on a 180px grid and are available in multiple formats.
Blunicons – 60 Essentials Icons
Here is a remarkable set of 60 essential icons designed in an unique manner. All icons are free to use in your various projects and are available in multiple formats.
Ego – 100 Vector Icons
Check out this original set of 100 free icons designed with a radical angular style guaranteed to make your designs stand apart.
File Types Icons
20 file types flat color icons: image, video, zip, doc, xls, csv, html, jpg, txt, envelope, charts and more.