Great topic.
The WTC has become famous as a warm-up package - various stories about great pianists playing through book 1 or 2 before breakfast. I'd be proud to play through 3-4 of them every day but I'm not working on those right now.
Another well known warm-up set are the Chopin Etudes, as a few have already mentioned. Personally, I don't care to go through Chopin's cathartic minor-key emotions first thing in the morning (as found in 10/4, 10/12, 12/11, 12/12, to name a few), but his major key ones work...
I typically warm-up with Czerny etudes from Op 299 and 740, and mix in some by Moskowski and/or Chopin.