White Magik is perfect for white minimalistic sites and can be used with image hover for excellent looks! Includes: 45 Icons:
Blogger /Blogspot , Delicious, Digg, Facebook, flickr, Design float, Linkedin, Mixx, Myspace, Netvibes, Reddit, RSS, StumbleUpon, Technorati, Twitter, Visualizeus, Wordpress, Yahoo, Apple, Blinklist, Design bump, Google, MySpace, Orkut, Yahoo Buzz, YouTube !

Sizes: 128×128 , 100×100, 64×64
Format: .PNG icons compressed .ZIP file

Download: WHITE MAGIK - A Free Social Icon Pack

The set contains 16 social icons in (transparent)PNG format.

Download: Page Peel Free Social Iconset

Weby Icon Set brings to you 100 icons at 64×64 pixels ready to be used in your application or website.  The icons are available in PNG, ICO and ICNS format. They are free to use for both personal and commercial projects, including websites, templates & software. You are not allowed to sell or redistribute the icons anywhere else.

Download: Weby Icon Set

Four months after releasing Handycons icon set, jankoatwarpspeed released Handycons 2 - icon set containing 20 more hand drawn icons. This time it is not limited just to socail media related icons. Package contains Facebook, Blinklist, Feedburner, Flickr, FriendFeed, Furl, Gmail, Google, Heart icon, Last FM, Linked IN, Magnolia, Newsvine, PayPal, Skype, Sphinn, Twitter, Vimeo, Yahoo and You Tube icons. All icons come in four sizes: 16×16, 32×32, 64×64 and 12×128px. And they are all free, of course

Download: Handycons 2

Here is the grungy version of the popular Aesthetica icon set. Designed to fit into your grungy-styled websites, blogs, applications, etc. Demanded by many of our users, the grungy version will surely be one of the most popular free icon sets at DryIcons.com. Our “Grungy Aesthetica” icon set contains 181 high quality web icons in 32-bit transparency in PNG file format. They come in 32×32px; 48 x 48px; 64×64px and 128 x 128px size.

Download: Grungy Aesthetica Free Icon Set