Evernote, one of my favorite applications, is currently on sale. It is regularly 49.95, now priced at 19.95 for a short time. That's a pretty good deal, but many users will actually be happy with the free version.
Evernote is a notetaking / journaling application that takes a different approach from its competitors as well as offering powerful unique features. Evernote's goal is to be your '2nd brain'. The idea is to offload everthing you can to it so you can free your mind for better things. Evernote's interface is a continuous 'roll'. You create entries chronologically rather than create a new 'note document' for each one. Evernote has power tagging and search capabilities for finding this information later and sync capabilities for keeping multiple machines current. It also comes with a clipping tool that will allow you to drop images and content from any app or web site. Evernote automatically creates hyperlinks to most information such as the path to a file you clipped from or the URL of the web site.
The real power however is in the advanced features. These are the ones you actually pay for. One of its more impressive features is advanced image recognition. Evernote will attempt to do text and handwriting recognition on any image you store in it. This means you can take a snapshot of a product or a whiteboard and actually search for the text contained in the image. That's real power. For tablet and UMPC owners Evernote has advanced inking and shape recognition tools that make it a breeze to capture notes in a more natural way.
Evernote currently runs on Windows, but they are actively working on Windows Mobile, Mac and Web based versions.