When I was a Mac user, I alternated between XJournal and iJournal. XJournal's fuller featured, but less stable and hasn't been actively developed for ages; iJournal's stabler and in active development last I heard.

BTW, Camino is like Firefox but runs faster on a Mac. But it doesn't have as many features. But if you prefer speed to features, Camino is really great. (Me, I prefer features, but it was a wrench giving up Camino.)

And Vienna's a good aggregator for RSS feeds.