A very useful tool when searching for informations/documentation/solutions about Unity.

Unity-related search, including the Unity site, Forum, Unity Answers, Wiki, plus Nvidia and MSDN (for shader and C# reference) and a handful of Unity community sites

http://www.google.com/cse/home?cx=001712401338047450041%3Acsfhqk-trfa

If you are using Chrome browser, you can even use this search engine with a quick shortcut by doing this :