Not sure if anyone has visited tutorials20.com, I'm 99.9% sure that its using Wordpress MU, the only reason I'm not 100% sure is because it wasn't in the Strut your Stuff section, and I figured a site of this caliber using MU would have already made it into that forum, but then again the webmaster prolly doesn't like to strut his stuff :P.
Anyways lets break this down:
1.) Firstly how do you achieve a simple sign-up used on this site? Its like a WP-Login asking for Username and E-mail and no fuss about privacy setting and all that hoopla, and I believe it automatically sets you up as author.
2.) The top 10 tutorials section which I'm sure is pretty easy to achieve, but if you look closely it has thumbnails of the finished outcome of the tutorial, but if you click on the link there isn't any image within the post that it could possibly pull that image from, because the tutorials is actually one giant jpeg.
3.) The admin area has the header with the navigation integrated, I'm assuming I just have to fiddle with a php file, but I hope someone can elaborate on this.
4.) How do you clean up the admin area so Wordpress updates aren't pegged all over in the dashboard section, if possible can dashboard be removed :P.
As great as the site is and the potential of MU, there are some things that I find a bit clumsy with MU, which I thought I throw out there hoping that we could find a fix if possible. The problem I see is within the admin section where comments waiting for moderation are being shown although it isn't authorized for your approval, as well as the managed section where it shows all posts from all members which I think is rather dumb because finding your own post to edit seems like a tedious task to sift through, although functional it is a bit bulky.
Thats all I can think of for now, but I'm hoping people sign-up and explore the site a bit and maybe we can all work together to break this site down and help others trying to achieve something similar? Sorry for the long post, but I feel this has been the best example of MU's potential and I feel we could all benefit using this site as a standard. Thanks in advance.