Tofumakes reading on your computer a whole new experience and much more like reading a book. Drag or paste text into Tofu and it arranges everything in classy columns that scroll side to side (not up and down). This is ergonomic reading on your Mac.
xPad is an excellent application that serves great as a word processorFor most writing a word processor. Your notes sit in a sidebar and save automatically when you quit. Way better than stickies or TextEdit.
SpamSieve is an application for anybody who uses Mail for Mac. After a few days of training, SpamSieve will obliterate junk mail and leave good emails untouched. The app is free for the first 30 days, then worth every penny.