Due can be used to keep track of things you have checked out, things you have to do by a certain date, and more. Its features include color-coding and sorting by due date or warning date.
I'm glad I read the reviews before I downloaded this widget. I agree with "yezdi". If it doesn't let you keep the due dates for monthly bills then you might as well use your Outlook Calendar. I would use this IF AND WHEN it is ever upgraded to be really useful.
I love this widget, but I'd like to see a place where you can add a url. I use this for movie rentals, library books and online bills. It'd be handy to link to online bill sites.