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: 32762 - Shareware - Download Now
Chameleon Icon converts images of any format into Windows icons with just a few clicks. Convert any picture or photo in BMP, JPEG, GIF, PNG, PSD, TGA and TIFF format into icons for your Windows desktop, applications, folders, email and ICQ contacts.
Downloads: 32844 - Shareware - 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: 33696 - Demo - Download Now
Large PNG Icons collection is the perfect choice for any web designer looking to maintain high quality UI graphical representation but looking to save time. Available sizes range from 16x16 to 512x512 pixels and file formats include ICO, BMP and PNG.
Downloads: 32631 - Demo - Download Now
More than 300 High Quality Royalty Free icons set for Windows, Mac and Linux, You will find the best free icons from the icon artists
Downloads: 32924 - Shareware - Download Now