Peg.gd is a quick way to create and share single pages of text and more
The whole thing has a zen garden, forced minimalism feel to it, the kind seen on a lot of Ruby-based projects (I bet this thing is a Rails app, but I may be wrong). I happen to like it, but that's really a matter of taste.
The text is formatted using Markdown, which happens to be my method of choice. No account is required, and the Peg.gd About page says it's because "you're a person, not a rich vein of data to mine." You can also embed videos and images, but I didn't test this because it's not readily accessible to the average user at this point.
Peg.gd uses HTML5 local storage for saving your text as you type; that means that on my aging Firefox 3.6.8, it was really slow. But as long as you use a bleeding-edge browser, you should be fine.