In the longer term, I'd quite like to get a complete set (MCSA, MCSE, MCAD, and upgrade my MCSD to .NET); that's about another dozen exams overall. There are also the CompTIA exams (e.g. A+, Network+, Security+) which I've got training manuals for, although they're on my unread (or part-read) stack at the moment. Then there's my backlog of computer magazines to read through... I was interested by a book I saw recently: The Know-it-All, about a guy who decides to read the entire Encyclopaedia Brittanica in a year. I've got the books on my shelves here (still shrinkwrapped until I've finished painting), and that sounds like a useful thing to do, if only to improve my skills at Trivial Pursuit.
More generally, I'm not sure how things are going to work out in terms of a PhD; it's on hold for the time being until I've paid off my various loans. But if/when I do start that, I'd like to be able to focus on the core subject that I'm researching, so the more things that I can clear off my "to do" list before that, the better.