If you depend on Automator workflows for managing music or other tasks in iTunes, the upgrade to version 10 may have come as a bit of a cold shock. Macworld pointed out that most available workflows for iTunes simply would not load with iTunes 10; a frustrating circumstance, to be sure.
Fortunately, the problem turns out not to be that complicated; Automator's version checking thinks that iTunes 10.0 is a lower version than 9.0, because the versions are sorting alphabetically instead of numerically (oof!). Macfixit points to a workaround: opening up the Info.plist files inside the packages for the dysfunctional workflows and manually changing the version threshold. It's not ideal, but if you have critical Automator functionality that would otherwise keep you on iTunes 9, it's worth a try.