Evernote CEO Phil Libin discussed the amount that the company makes off of its 1.4 million paying users, breaking it down by operating system and non-core applications (some third-party, some made by Evernote). iPad users spend the most money of any mobile platform, while Mac OS X users spend more than their Windows counterparts. Evernote now has 34 million users and is sitting on a $1 billion valuation before it goes public at some point in the future.

[Source: TechCrunch]