If you have been looking for a note taking app that allows you to type as well as write, you might want to check out Noterize. [Right now 2011.07.02, it is FREE. Before you download, make sure the price has not changed.]
You can watch a video here.
The app allows you to view and annotate PDF and powerpoint documents. The built in web browser allows for direct importing of readable files from the web. You can even record audio notes. There is also Dropbox and Box.net integration.
Built in search functionality lets you find what you are looking for quickly.
You can even share pages with friends via social sites or email. The built in password protection can help keep notes secure.