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Huh—some quick Googling turns up some interesting-looking pages:

• Soundproofing 101, which gives useful information for people who can tear their walls down or who are building soundproof studios, but not so much for soundproofing a bedroom window in a rented apartment. But they linked to:
• Soundproof Windows, which supplies custom-made windows that apparently fit inside regular windows and do serious sound abatement, while also cutting down on UV. I suspect this is not so good, though, for a window that's 6' wide and 3' high, and the costs are relatively high.
• However, I also found Super Soundproofing, which sells all sorts of stuff that looks like it'll do just what I need, assuming the window size doesn't turn out to be a problem. I'll call them tomorrow.