Here is an App Tab Bar Icons for iPhone collection, which will help each iPhone or iPad application developer get his GUI in order. The icons from this set can be used in navigation, tab bars and toolbars of iOS applications.
Downloads: 78032 - Shareware - Download Now

Volumetric Social Media Icons is a pack containing 40 high quality icons depicting the logos of 40 social media websites for integrating into your website or applications.
Downloads: 68682 - Freeware - Download Now

Small Glossy Icon collection of professionally drawn clipart and basic toolbar icons. Suitable for any application, user interface (UI icons), png icons are ideal for web design (social networking and business use) and in the creation of templates.
Downloads: 104873 - Demo - Download Now

Enhance your multimedia project for High Definition displays with ready-made Multimedia Icons for Vista. Cut down your project costs and speed up development by using a set of carefully crafted, high-resolution icons!
Downloads: 73670 - Demo - Download Now

Small Network Iocns is a collection of network-related stock icons. This royalty-free collection is distributed as BMP, PNG, GIF and ICO files. Each icon has 16x16, 24x24, 32x32 and 48x48 versions, as well as variants with and without shadows.
Downloads: 96222 - Demo - Download Now