It's subscriber only, unfortunately, but that's no reason to miss Robert Zubrin's devastating analysis of the last several decades of space policy in Commentary. The piece is informative, imaginative, and extremely well written. Upon finishing it, I immediately looked up Zubrin's book, The Case for Mars.
And while you're at it, don't miss Charles Krauthammer's "On to Mars," from the January 31, 2000 issue of THE WEEKLY STANDARD.