BdCalendar has a lot going for it.
Access to addresses, calendar, notes, todos, etc. directly from the Menu Bar. It's actually quite powerful with an overly complex, cluttered and confusing interface, plus some downright ugly icons and buttons. There are some odd window and menu behaviors as well and a lack of consistency. Fonts cannot be changed. (a MAJOR negative)
The interface reminds me of DateBk on the Palm and iClock on Mac OS X. Apps that tried to do too much for their own good (I used both for years).
BdCalendar has A LOT of features and power, but it's hampered by a convoluted interface If the developer would seriously sit down, streamline and clean things up, he'd have one helluva utility. For now, it's worth looking at and some may like it. The price is good.