Common terms/words used such as :

Array

Constant

Scalar

etc

would be added with a description, so it would be very easy for people to quickly find out whats what. In addition as this site gets bigger and people start talking in 'php/programming talk' any terms in the glossary that are written in posts get dotted underlined, and rolling the mouse over it - gives you a description of what the word means...

Would make talkphp not only an excellent information resource, but would add to the useability especially for newbees and those that cant remb what programming phrase etc means.

Just an idea, but it's perfect for things like programming sites ;)