I think this is a fabulous idea - we house this information in a few other locations, but it totally makes sense to be centralized where you're testing!
Just wanted to let you know that we've incorporated this idea into the new dashboard, which we're beta testing now. To try it out, just visit http://www.optimizely.com/dashboard and then click the link at the top of the page that says "try the beta". I'd love to hear your feedback!
Specifically, you can add notes or a hypothesis in the new dashboard by selecting an experiment and the clicking "Edit Text" in the description category on the right. You can also use #hashtags in your notes and search for them later for easier organization.
