With KeepNote, you can store your class notes, TODO lists, research notes, journal entries, paper outlines, etc in a simple notebook hierarchy with rich-text formatting, images, and more. Using full-text search, you can retrieve any note for later reference.
Megazoomer makes windows full-screen. Just press Command-Enter, and the front-most window grows to fill your entire monitor. Press the same keys, and it shrinks again. Requires SIMBL