Well, I thought I'd throw in my 2 cents.
I've been using One Note for a few months now, primariy because it came with my new laptop preinstalled. It was nice, helped out quite a bit but there was also more than a handful of nitpicks I had using it.
I saw this thread and checked out a handful of the alternatives.
I have to say so far
The Journal is my favorite. I've organized my latest campaign, the tree view is great, linking is great especially with a local copy of the
SRD, the tables are great, I'm loving it.
I have very little doubt as to whether I'll purchase it. It's almost a sure thing. I start DM'ing my games next week so we'll see how it works in game. I'm looking forward to it.
The daily journal will come in handy for each gaming session. I can take notes during my gaming sessions and it's tracked by the days and I can link my notes back into the campaign.