Birdsoft (see my Extreme Text review), who has been making WM smartphone (read non-touchscreen) software for years now has recently adapted one of their most popular productivity apps to the WM professional platform: Extreme Agenda (v3.1) ($24.95).
Admittedly, the default calendar, contacts and the rest of the PIM features on WM are a bit underwhelming. Sure, for basics they do their job but what really attracts people to WM in the first place is one word: customization. They want specific colors, only certain days to show, linking between notes & contacts, specific views, etc. And wherever there is a whole, there is some crafty 3rd party developer waiting to fill it. Unfortunately for you the consumer, you may be overwhelmed at the choices: Agenda One, Agenda Fusion, Pocket Informant, Agendus