Admittedly, it took me a time or two to really get Scrivener. It wasn't until I saw the quicktime movie for the program that it "clicked" for me. Now, Scrivener has opened up an environment that is wonderfully conducive to the writing process.

Though I (slightly) prefer WriteRoom's options for writing in full-screen mode, Scrivener's capabilities for organizing & composing material is unmatched. The full-screen mode is not at all bad either.

To top it all off, the forums on the developer's site are active and full of great advise & perspectives. I'd recommend all current & potential users pay it a visit.

At the minimum, it's worth a download, but to get the most out of it, watch the developer's movie!