Just curious... what time do the shops at DTD close generally? I was thinking of checking it out one night, but I wasn't sure how late everything stayed open. Thanks :)

For the Marketplace shops, Sun-Thurs they close at 11PM. Fri/Sat: 11:30.
Marketplace restaurants close at 11PM nightly.

I believe the West Side is a little later, but not sure. (Never really been anywhere other than the marketplace.)

I pulled this from the February 2009 calendar- but this is pretty typical:

Downtown Disney Venue Operating Hours Dates

Pleasure Island Shops 10:30am – 2am Daily
West Side Shopping 10:30am – 11pm Sunday-Thursday
West Side Shopping 10:30am – 12 Midnight Friday-Saturday
Westside Dining 11am – 12 Midnight Daily
Cirque du Soleil Theater-Shows 6pm & 9pm Tuesday-Saturday
DisneyQuest 11:30am – 11pm Sunday-Thursday
DisneyQuest 11:30am – 12 Midnight Friday-Saturday
Marketplace Shopping 9:30am – 11pm Sunday-Thursday
Marketplace Shopping 9:30am – 11:30pm Friday-Saturday
Marketplace Dining 9am – 11pm Daily