After trying out a ton of apps, I like the results and features of just using Pages (iWork) and SketchBook Pro the best.
I'm thinking about giving Pages a try.
Is there a way to use the iPad as digital voice recorder?
Sundry Notes allows you to record while typing notes and embedding symbols and such...
You should try "Penultimate" with a Pogo Pen really usefull.
I finally decided on Paperdesk. I like that you can switch between text and freehand drawing easily in the same document. Its very similar to Journal on the TabletPC is you have ever used that.