MindManager is available for Mac OS!
I’m happy with the Windows version right now, but it looks like a pretty good application. Very Mac-like, not just a port of the Windows version. I haven’t looked in depth, but it seems that the major feature it’s missing is the integration with the Office products. With MindManager Pro for Windows, I can link tasks and calendar items from Outlook to MindManager. I can export a map to a PowerPoint presentation or a Word outline. I don’t see that level of integration with Office 2004 in the Mac version. In other words, it’s in line with the basic Windows version, not the Pro one (and the pricing matches too).