Google & Evernote recently announced a partnership in which Google Drive documents will now be more easily accessible inside Evernote. By doing so, it signals that Evernote is aware that their service is not widely used for collaboration, despite pushes for that sort of application through their Evernote Business suite.
Rather, Evernote's strength is in creating an individualized library specific to a single user's proclivities--Vannevar Bush's memex machine, uniquely and particularly suited for the user.
Since Google Drive is a far more common tool for collaboration than Evernote, and Google's market penetration is considerable, the relationship is complimentary. Evernote concedes a weakness (collaboration) and plays to its strength (individual work and organization), and Google adds an additional feature to make Drive that much more compelling.