Reading blogs the other day, I came across the Dina Programming Font. I've been testing it out for the past couple of days in Eclipse and so far I really like it.
Over the years I've tried a number of different fonts for my IDE, but I always end up back with Courier New—mainly because it's familiar. However, I've been able to use the Dina font at 8pt and it retains it's readability very well at 1028x768. Lowering the point size while not adding strain for my eyes, allows me to see more code on the page w/less scrolling. Since I have carpal tunnel, anything that reduces mouse movement is a welcome change.