From Gnarfle Technologies:
MenuCal is a simple OS X menu item that displays a calendar with iCal information available for the selected date. It is currently in it's infancy and is being made available to gather feedback. Please visit the website for more details on what it can and can't do in it's current form.
MenuCal is donationware. If you like it and use it, feel free to visit the website and make a donation. There are no registration reminders, and if you don't think it's worth paying for, you are welcome to continue using it for free.