Part of the reason that email is so sticky is that it has an incredibly high DAU.
Google Search
GMail/Google Calendar (or device specific version: Taskbox/Sunrise) Rapportive Google Hangout/Skype Twitter LinkedIn Dropbox/GDrive
Prismatic CardMunch Kik/iMessage/SMS/GChat
I have been off the Evernote. And I'm still trying to find a to do list that fits my workflow. I