This Flyertalk thread highlights current Travelocity promotion codes for two, three, and four night hotel stays (you can of course make separate bookings to capitalize on extra savings, e.g. a six night stay could be a 4- and 2- night stay to use both the $100 and $50 coupons):

AMAZING50
Save $50 when you book a two-night hotel booking or flight + hotel Package (minmum spend $250) and travel between October 10, 2008 and October 31, 2008.

AMAZING75
Save $75 when you book a three-night hotel booking or flight + hotel Package (minmum spend $400) and travel betweenOctober 10, 2008 and October 31, 2008.

AMAZING100
Save $100 when you book a four-night hotel booking or flight + hotel Package (minimum spend $500) and travel between October 10, 2008 and October 31, 2008.