After thoroughly trying out DEVONthink Pro and several competitors, I just registered DEVONthink Pro (Infoworker’s Pro Bundle, actually).
I love DEVONthink Pro, but it really needs better outlining capabilities. The TextEdit/RTF engine outlining capabilities are terribly basic, and really don’t work very well.
I’d love for DEVONthink Pro to either support LinkBack (at least as a LinkBack client) so that I can use my preferred outliner (OmniOutliner Pro) which will support be a LinkBack server in a future version (its a LinkBack client now), or provide more robust outlining capabilities natively.