So, yesterday I ordered on Amazon.com a book about PHP and MySQL. From what I can gather from some preliminary tutorials, this would be an excellent way to automate people adding links to the directory. It's possible that I may be even able to automate checking the reciprocal link for the exchange, as well as alphabetizing and sorting and what not. In any case, it is a great tool to learn for a budding website specialist like myself.
I'd definitely like to make another run at making this site great, but I can't do as much work as I used to (checking and adding by hand 100+ links a week ended up being about 10 hours of work). So, we'll see how it goes...