I do use DevonThink for most of my information organisation, but MacJournal’s, well, journal feel could be quite interesting. And it, hopefully, can publish to my blog, which is the real purpose for writing these words.
I may post more if the software become more useful. You never know.
[Update: 22/09/10] I don't use it much, actually. I've added MacJournal to my Dock, in the hope I'll jot down notes that could become posts.