Evernote

Evernote is probably the application I use most frequently. I use Evernote to capture and organize all kinds of data all in one spot.  By far the majority of content is articles from the web I want to keep for later reference.  One of the key features for me is the ability to access it from any computer I want.  The data is kept both locally and in the cloud.

While tagging is available, I find it far more useful to organize by notebooks.  As I add more and more content, I continue to add additional notebooks keeping each notebook a manageable size for me.

I have been using Evernote for over a year now, and have not needed to upgrade from the ad-supported free account.