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Corkboard

This is another of the 'stickynote' type of resources. Just visit Corkboard.me and it'll instantly set you up with a page that you can use there and then. Type in your notes, move them around, link to images and so on. Share it with friends and let them collaborate as well. It's very basic in comparison with some other resources that are out there, but it's quick and simple, and that's always a good thing.

Clever Notes

Simple web notes. Wallwisher like application that allows you to save and share notes with other people. Free, but ad supported.

Shapado - questions & answers

Shapado is a Q&A software and Shapado.com is a hosting service that allows anyone to create his own Q&A site for free in less than 8 seconds.

Qhub

A simple way to create a Q&A website. This is a system to allow anybody to build a Q&A website in minutes. Simply choose a Qhub name and address to build your very own Q&A site.

Free Forum Hosting

Free Forum Hosting. Lefora looks rather interesting. They'll create and host your bulletin board/forum for you. You can custom it, they'll catch spam, you can moderate however you wish, nothing to download - create newsletters, use widgets - looks very impressive.

Tangler Discussion Forums

Tangler Discussion Forums. Nice looking site, that allows you to create your own discussion forum or bulletin board. Simple to set up, and they host it for you. I created one at http://www.tangler.com/forum/phils-forum if you want to take a peek, though there's not really anything there - feel free to start a conversation if you'd like to.

ProBoards

Link: ProBoards.com - Free Remotely Hosted Message Boards. This looks to be of interest if you want to run a bulletin board but don't want to have to do it yourself.