Sizcons

"Sizcons is my own little icon set. Sizcons, if you couldn’t tell is a combination of my last name plus the word icons.
I will probably add more to the set later, but for now, I wanted a few icons that I could call my own, which were the exact colors I liked and that I knew I would use. I didn’t bloat the set with ones that I knew I would not use, so that’s the reason for a small selection.
The icons are free, so use them however you see fit. If you do use them, it would be nice to get a link displayed somewhere on your site saying where you got them, but it’s not required." by randomjabber.

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Mini Pixel Icons

"The package includes 320 icons (available in various color theme) for general web design such as: blog themes, forums, eCommerce sites, and CMS application. They are designed at 14×14px with transparent background, which is suitable for footer or sidebar navigation buttons." by IconDock.

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Cafe Icon Set

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Other Icons:
Social Network Icon Pack
White Magik
Social Icons by Design Reviver

Symbol Signs

"Title of your Iconset or Desktop Image : Nice looking icons that represent the most known devices of apple such as I Pod. This icon set is designed with a pale white (grey scale) and very little blue contrast. An icon collection as sober as every object that conform the mac family objects. A quite clean set with extruded and detailed look created for fanatics of technology devices.
Number of icons in the set: 5 icons
The sizes of your desktop image(s): 256X256,128x128,48x48,32x32,24x24 and 16x16" by IconShock.

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Other Icons:
Margin

Drink Web 2.0

Download this free Windows Vista icon pack for your Website or Application. 27 icons in formats PNG (256x256, 128x128, 48x48, 32x32, 16x16), ICO (256x256, 128x128, 48x48, 32x32, 16x16) and ICNS (256x256, 128x128, 48x48, 32x32, 16x16). Bonus: 2 Wallpapers in JPG (1024x768, 1280x800) format.

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Office Space

6 icons, sizes: 48, 32, 16

by VisualPharm.
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Futuristica Icon Set

"Futuristica has arrived friends, the new free icon set from DryIcons. We've created this unique and useful icon set to help you bring attention and show your creativity in your projects. The Futuristica icon set is all that: unique, creative and fun. Get that WOW effect with these unique icons in all your projects, websites, blogs and back-end applications. The future has arrived! This free icon set contains 20 high quality, free icons in these sizes: 32x32px, 48x48px, 64x64px, 128x128px and 256x256px in 32-bit transparency PNG file format." by DryIcons.

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Other Icons:
Xedia
Alcohol Icon Set
Let Pixel Icon Set