My digital in sources are in three areas:

1. OmniFocus - my primary collection point. The iPad version is my most frequently used and favorite version. I also have the desktop and iPhone versions syncing via Omni's server (works great).

2. Email - Apple Mail for personal email and Outlook for email at work

3. Apple Notes - I use this occasionally as a digital equivalent of my Notetaker wallet. I mainly capture here from my iPhone because I have an aversion to the "micro fonts" in OmniFocus for iPhone.

I occasionally use Noteshelf which is an iPad app that emulates a notebook with handwritten notes. But I've found the real handwritten method better - i.e. paper and pen.