One of the things I really want to see more of is a robust 3rd party component ecosystem for Flex. We’ve come a ways with things like ILog, but I want more. Hopefully some of the new Flex 4 features will make it easier for developers to create easily customizable, useful components. In the meantime, if you’re looking for a calendar component, then ImBizzi looks pretty powerful.

It’s an Outlook style calendar that lets you drag and drop to add calendar items switch between day, week, and month. It should have everything that you need if you’ve got to add a calendar to your application. There is good developer documentation and a style guide that lets you customize the look and feel of the calendar.