Happy birthday, bh2. Now I have an excellent excuse to squeeze down a few more tonight! Now, now. What would A-S have been without you, applethink? Oh, you mean an upper age limit?
GUIdebook. Shock-full of info and screenshots of all the GUI-enabled OS' to date. Plus, the site layout is sweet. You might be able to get some good info here, too. Steer clear of fan sites if you can.