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Soundproofing windows...

As much as I hate the idea of the door-to-door salesmen related to such, Double glazing? - Expensive I know.

I used to do studio control room windows with three thick panes of glass, the center one not parallel to the outer ones, so that pressure differential was not linearly coupled. But for house windows a couple layers will probably have to do. For band rehersal in the basement I built window insert boxes out of double-layered MDF onto 2-by frame with double-layer MDF on the other side, interior stuffed heavily with fiberglass.

Apart from that, I've heard that thick/heavy curtains are great for proofing doors and windows.

For higher frequencies they can help a little but they don't do a thing about lower frequencies.
 
If you're talking about soundproofing exterior windows, you'll need to add mass, stop air leaks, and minimize sympathetic vibrations.

Fill the voids around the frame, and then build inserts that cover and plug the window. Ideally, the insert will layer different materials (the boundaries between different materials take a toll on transmitted acoustic energy & vibration).