Great OmniOutliner Overview and Resource
OmniOutliner is one of my favorite applications for the Mac. I tend to do a lot of my thinking in OmniOutliner. Giles Turnbull offers a great overview in Flexible OmniOutliner over at O'Reilly Net's Mac DevCenter. The insights include outputting the outlines into iPod, MS Word, Keynote, and much more.