Organize your brain.
This is an interesting one and handy for keeping nice looking lists and notes on your computer or portable device. Not only can you keep the notes synchronised across many computers and devices but you can also share your notes etc with others by sending a link via your favorite method of keeping in touch.
Registration is free for most of the features but if you decide to plonk down US$49.00 a year for the pro version you can create unlimited lists, backup your notes to dropbox, share notes with password protection, use custom themes and fonts and very soon edit your notes offline.
The free version is great for creating lists with no more than 500 items a month so feel free to give it a try.