Due to my great passion for web designing and icon styling I have made this list so that it can help many other designers. When you see the icons sets and go through the respective sites you can find more amazing designs. Icon sets I have shown below can be downloaded  when you go to the link shown below each icon set image. For most of the icon packs fully editable PSD files are there. OK start looking below.

1. Great Web Button Set

The icon set has totally 200 icons which has 20 icon styles. The icon set has full layered PSD and so its easily editable. The icons are sized at 32x32px.

Here the Great Web Button Set

2. Exclusive Copenhagen Set

The icon set has 25 Web App Icons in 3 sizes that can really spice up your website. It comprises of icons for payment, email, downloads and much more.

Here the Exclusive Copenhagen Set

3. Ultimate Designers Icon Set

The icon set has 750 icons at a size of 48 x 48px and includes all the .PSD sources. It comprises of keyboard icons, email icons, e-commerce icons, flags, general usage icons and many more.

Here the Ultimate Designers Icon Set

4. Beautiful NIXUS Icon Pack

The icon set comprises of 60 high quality premium icons and they  are available in different sizes of 32×32px, 48×48px and 64×64px. Icons are in transparent .png format.

Here the Beautiful NIXUS Icon Pack

5. Pictodeck Icon Set for Keynote

Pictograms are in vector and there are totally 700. Since they are in vector format they can be rescaled to any size without loss in quality. The icons support transparency.

Here the Pictodeck Icon Set for Keynote