Here is a TabBar Icons For Mobile Apps, which will help each iPhone or iPad application developer get his GUI in order. They are licensed under a Creative Commons Attribution-Share Alike license. You may use the icons for web design also.
Downloads: 37092 - Shareware - Download Now
Instantly enhance your software with readily available, professionally designed icons. Blue Icon Library contains dozens of icons that are designed to look strict and stylish. These icons will enhance the appearance of any business-oriented product.
Downloads: 52706 - Demo - Download Now
Cute Smile Icons is a ready-made solution for messaging software that will help to spice up communications. It includes refined status and chat-style icons expressing various emotions. All emoticons are available in various color depths and sizes.
Downloads: 51165 - Demo - Download Now
Your web pages will look more modern and attractive with Web Icon Library. This icon library includes standard web icons in plenty of formats (ICO, GIF, PNG, BMP), resolutions (from 16x16 to 256x256) and 2 color depths (256 and 16.7 million colors).
Downloads: 34115 - Demo - Download Now
Free 3D Social Icons represent a free icon collection well-suited for websites and applications associated with all sorts of social network websites. The pack delivers images depicting various communication technologies and websites.
Downloads: 26615 - Freeware - Download Now