Easy of use. Simple as pie and doesn't have a lot cluttering the displays. Blue background is soothing and the categories are arranged in a way that makes a lot of sense.
Nothing comes to mind. Would be nice to have more cross-integration with programs like Outlook, Gmail, or Evernote but i'm getting a lot out of it as-is.
Give it a shot if you don't have any project management software available currently. Does a fantastic job of keeping your business on track, and best of all it's free!
Solves issues of having to keep track of everything and make sure it all gets done. Also solves issues with archiving tasks showing you task and comment information. The big benefits have just been knowing I can throw just about anything on there and save it for later and it actually gets done.