LeanTween is an efficient tweening engine for Unity3d
Full Documentation:
http://dentedpixel.com/LeanTweenDocumentation/classes/LeanTween.html
This can also be accessed offline! From the Unity menu Help->LeanTween Documentation
Getting Started
There are many examples included! Look in the “LeanTween/LeanTweenExamples" folder to see many of the methods outlined.