We've all come across pastebin sites before. They allow you to dump a bunch of text in one place that you can quickly and easily share with someone else. NoteHub does the same thing, but it comes with the added benefit of supporting HTML markup.
The site removes all the fluff and gives you a simple WYSIWYG editor that supports basic HTML. If you need to set up some common directions or include media in a page you intend to share, without the hassle of setting up a server, NoteHub works swimmingly.