Noodleboard
This seems like a real contender for coolest dashboard widget, if they add just a few more features. They describe it as a cross between OmniOutliner and SubEthaEdit; of course, at this point it’s more like a cross between Stickies and SubEthaEdit—i.e., it’s a very small barebones text editing application that allows synchronizing across multiple dashboards. When you register, you get a name for the board, a pin, and a password; the password is not a password in the typical sense, in that it isn’t submitted to the site and checked against their records; they do not, as I understand it, keep a copy of the password at all. Rather, the password is a key that encrypts the data you’re sending before they receive it, and that is used to decrypt it whenever you download the latest version.
If you want to share your data with someone else, you simply give them the name, pin, and password, and then the password is used to decrypt the data, again locally. The password can be changed at any time, so long as everyone knows about it. I wonder what happens if people are using different passwords. It would be cool if it let you use different passwords persistently—this would enable you to share information selectively with multiple parties, and maintain de facto multiple workspaces.