Doodle Jump has been updated to version 1.24, which introduces a new Halloween theme: Doodlestein! The update includes new monsters (zombies, vampires, and witches among them) in the Halloween theme, plus broken bone platforms and a broompack (a jetpack made from a witch's broom).
Doodle Jump developer Lima Sky also announced that the next version of Doodle Jump will support Game Center. Now the only thing I'm waiting for is an iPad version of the app. Version 1.24 of Doodle Jump is free to those who have already purchased the app; for everyone else, Doodle Jump is US$0.99 in the App Store.