More robust data visualizations
First off, I have to say you guys are doing an kickass job with this app. I've used a host of different productivity apps, and this one definitely takes the cake.
With that said, it would be AWESOME if you were able to build out the data visualizations a bit more. For example, if you could implement a Pivot Table of sorts that would allow you to dynamically view completed tasks by folders, tags, and colors, that would be clutch.
....and again, nicely done!! :)