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I use MindManager. It can link to some OF objects, but not all of them. (I think you can link to those that show up in Spotlight, but not the others?)

I find mindmapping useful for getting an overview of areas of focus and the like, but not so much in the day-to-day, task-by-task GTD process.

There's a two-page article about mindmapping and GTD in the second issue of Productive Magazine (a pdf can be downloaded for free here) which might interest you. Didn't have too many practical tips, though.