Try Wacoms first app for the Ipad for free till June 30th then the price goes to £1.19
Haven't tried it myself as I'm an Ipad hater but i like to share the love and bridge the gap.....
I think they will want people to buy the style pen but its free so it cant hurt to have a go!http://www.wacom.eu/index2.asp?pid=9222&lang=en
Stuff from the website
Turn your iPad into a paperless communication tool with Bamboo Stylus.
Enjoy the ease of your own natural handwriting as you sketch your thoughts on a neat digital paper notebook.
Quickly scan your book by browsing through thumbnail images of your pages or bookmark important pages.
Connect your iPad to a projector to show off your sketches and ideas to others at meetings or brainstorm sessions.
Send an individual page or an entire book by e-mail.
Pick your favourite colour for the book cover and select a paper type to match your needs.