MacJournal is good. Other options I've tried:
Journlr
viJournal and viJournal Lite
DEVONthink is not quite the same thing, but I've used it as a journal in the past.
Using a virtual machine like Fusion or Parallels to run The Journal on a Mac somehow seems like idling your car to use it as a CD player...
I must admit that the
Pavlina templates do intrigue me though...
Pres