While I think this could be a good idea, maybe a collection of how to threads or a collection of blog entries on the subject, I don't see it as the quickest way for YOU to learn. What I have found about learning to create a UI ( and other computer/programming endeavors ) is first try to do something. It's a good idea to keep it small at first. Learning how to do that one thing will get you knowledge that is easier to remember because you didn't just read it, but you did it ( and maybe said some choice words out loud related to it
). That will help your retention and also probably fuel your thirst for more knowledge. That has been my experience anyway.
Once again, I think something along these lines would be a good idea. Good idea for some blog entries I think. Maybe a wiki about the different parts of the game UI? Good thoughts for people with more time to devote to it than I.