Even iPhone apps are on sale for the holidays—here's a roundup of 40+ apps that used to cost money, but now don't cost anything. Most are nigh useless, but I like the Kitchen Timer.
Update: Their site is either down or epically slow, like the last eight years, so we're ripping the list for your perusal until they get back on their feet. (Sorry if it's our fault guys!) A quick iTunes search will take you to whatever one you're interested in: