TUAW posted a story that Apple has released a ninth beta build of iTunes 10.5 to developers

This is the second time that a beta build of iTunes 10.5 has been released separately from the routine updates to the builds of iOS 5, which has been at beta 7 since August 31st. As with the previous builds of iTunes 10.5, a Mac is required to install the build -- Windows builds have not been released.

  iTunes 10.5 beta 9 now available to developers