Have you ever edited a document, saved it, and then wished you could go back and change it? A reader sent this tip in: Versomatic allows you to retrieve old versions without hacking any code or accessing system files. I have not used it, as I run daily backups of documents, but if you don’t have this type of set-up, Versomatic might be worth a look. It costs $39.99 (no educational discount), which seems a bit pricey to me. But if you can’t wait for the new Mac OS X (Leopard), which will have this feature built in—say you are writing a dissertation now—this might be worth checking out.(Sorry PC folks, this is Mac only, if someone knows similar apps for a PC post them in the comments.)
Update: As reader co2 notes below, there is a PC version.