This is not a Photoshop tutorial but a good example to be inspired for new designs. A great video will show the transformation of a sketch to a cool icon. So if you are good in Photoshop, give a try to this.
Making an Icon from Sketch
Resources
Download Free PSD Avatar Icon Set
Another Icon Set where you can find nice Avatars also the PSD file. Designed by productivedreams this set include 5 Avatars that you can use in your website, project or in your instant messenger. The Avatar Set can be downloaded for free from author page.
Recourse with selected Icons from DeviantArt
Specially for this post, I select some of my favorites Icons Pack from DeviantArt website. Icons with different shapes and color where you can use in applications or projects.
The first set is make by Wojciech Grzanka. A pack with 128×128 icons not for commercial use.
Pixel Resort Free Icons
Internet Tubes, a browser icon replacement for any program, so no matter if is Firefox, IE or Safari.
Download Internet Tubes
Pixelicius icons a number around 150 different colors and shapes for any of your project.
Download Pixelicious
Recourses for your iPhone
iPhone tool box is a free resource for the iPhone, a really big resource where we can find free wallpapers, free icons and some apps for iPhone. Is cool when you go to see any wallpaper for the iPhone, because the popup iPhone is coming out and showing your the preview how that wallpaper will look in your phone.
Drink RSS for your thirsty readers
iPhone PNG Icons
iPhone icons in two colors, black and white in 3G version. Icons format is 256×256 px – Lockscreen, Mainmenu, Backside, Frontside, Wallpaper by d1niel.