I've been having some fun recently with PowerPivot for SharePoint. One thing I found while doing my digging was that the navigation for the DAX functions was a bit annoying. There was no overall reference online making you jump several pages to find what you need.
So, find below a table of all the DAX functions which link to the Function documentation on MSDN. This should also print out as a two page quick reference if that's of any use! :) Happy SharePointing!
Information Functions 





Logical Functions 



Filter Functions 



Math and Trig Functions 



Statistical Functions 



Text Functions 

FORMAT Function 

