Lazarus

Get Lazarus today, you’ll thank me later.

Lazarus auto-saves web-forms as you type, so if a server times out, your cat wanders across the keyboard, you close the page by accident, or anything else goes wrong, you can simply return to that page, click the Lazarus icon next to the form, and select what you want to recover. It’s just that easy.

Already saved me from losing my text (and my nerve) today. Hat tip to Karim for discovering this.