Haven't got the chance to try that one yet, but it seems like iAgenda which is using an open source similar the one used by iContact could be a really cool free app.
iAgenda is a finger-friendly appointments and tasks viewer for Windows Mobile PocketPC phones. It's easily skinnable, intuitive, and could be used instead of the standard Windows Mobile Pocket Outlook Calendar.
iAgenda has the usual 5 buttons interface: the first 3 tabs lists:
1 - all appointments
2 - all tasks
3 - agenda view (today's appointments and tasks)
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