Training for the 1500/1650: Suggestions?

So I have decided to focus on the 1500/1650, partly because I seem to have misplaced the three fast twitch fibers I once owned, and partly because guys named Smith are now swimming the 500 and even the 1000. Geek suggested that I build my endurance with dryland work, but unlike him I have a job and limited time to train, and I don't really want to give up pool time. Any suggestions?