InDesign and InCopy 7.5.3 Is Released
The presumably last update to InDesign CS5.5 has been released through Adobe Application Manager updates (choose Help > Updates if you don’t receive them automatically).
John Hawkinson created a comprehensive post about it at Adobe InDesign Forums with a list of bug fixes.
Among the bugs fixed that he highlighted are:
Import/Export: Wrong page number on export book to PDF
Print/PDF: InDesign hangs or quits unexpectedly during certain package and preflight operations.
But there are many more fixes, so you should download the update.