Android Icons is a set of 30 free vector icons that are originally developed to be used for Android applications but all are also great for websites.

They come in transparent PNG + EPS formats and can be freely used in personal/commercial projects.

DetectMobileBrowsers.mobi is a website providing a function & information on how to detect mobile browsers.

It can detect:

• iPhone
• Opera Mini
• Android
• Blackberry

It has an online function generator that guides you to create a personalized function according to "how you want to treat every browser".

P.S. The code is free to be used on non-profit websites.