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I tried MacJournal, but find it quite cold. Plus, there's always the risk of accidentally pressing a button and posting your private thoughts to your public blog.

Take a look at Day One. There's a Mac and a universal iOS version. It syncs, it doesn't have blogging features (for that, I think MarsEdit is probably the best) and, perhaps most importantly, it has a nice. comfy feel to it without looking like a 12 year old girl's diary.