1. Hint text. Good point. That implementation definitely sounds more useable, and of course, there's a jQuery plugin for it :)
2. There's no explicit way to merge groups, because it sounded like more of a hassle than it was worth. What do you think of avoiding the problem in the first place by suggesting existing groups as the user types in a group name to be created?
3. Separate add link button: good point. changing this.
4. Video: lets forget it. I've never done anything involving video uploading, and once I had a look at what a hassle it is to do, I don't think it's worth it for the amount of our users that will actually use it.
5. Step editor. Yes, also a good point. CKeditor seems perfect.
6. the importance of border-radii: cannot be underestimated. the PDF is supposed to be a bit more than wireframes, but is not intended to be that high-level of a design.
7. Captcha vs. email verification. I did think about this one a bit. I personally hate email verification more than I hate captchas, but is there some other reason to prefer one over the other?
8. ban user is about as useful as video uploads, and is probably not worth the hassle it entails. lets cut this.
9. early on, many of the people who've expressed interest in the site wanted to use it in non-english speaking settings. since there is no "settings" page yet (not enough settings to make it worth having one) the languages selector goes on the top menu rather than inside a settings section. Changing it at the very least changes the language of the UI (assuming this isn't too difficult) but could also change which protocols are shown (this sounds much harder.) Not an essential launch feature, on reflection.
10. The blog is just a link to a posterous/tumblr/whatever, for now.
11. The last page has a crude data structure diagram, but i'll add the users into it.
12. DIY bio page: That is a group page. The different headings on the page are categories within a group. I'll put this into the data model as an example.