TUAW reports that iTunes 9.2 is now available in Software Update

Features and improvements (aside from compatibility with iOS 4 devices) include:

Sync and read books with iPhone or iPod touch with iOS 4 and iBooks 1.1
Organize and sync PDF documents as books. Read PDFs with iBooks 1.1 on iPad and any iPhone or iPod touch with iOS 4
Organize your apps on your iOS 4 home screens into folders using iTunes
Faster back-ups while syncing an iPhone or iPod touch with iOS 4
Album artwork improvements make artwork appear more quickly when exploring your library

  iTunes 9.2 now available in Software Update