Bubble Browser, now available on the Mac App Store, is a new tool to assist in visualizing Evernote data. In particular, it excels at showing you tagged info, and presents larger bubbles corresponding to the frequency of use for a given tag. It's fast and easy to use, and I had a lot of fun poking around my "other brain" to see what I had been storing and what I hadn't tagged.
Bubble Browser can also search and sort by notebook, dates and titles, so besides the bubbles, you have a nifty sorting tool. While all of this may seem superfluous, the intent is to help spark connections between sets of data, and to help you see what you are spending time tagging or storing.
The app is currently free, so give it a try and see how good data mining can look.