UPDATE:
Apple IDs Were Not Stolen From the FBI
Apple responds to hacking news: We never gave the FBI UDIDs.
by Nic Vargus
September 5, 2012
Yesterday hackers for Operation AntiSec boasted that they had freed 12 million Apple Unique Device Identifiers (UDIDs) from an FBI laptop. The only problem?
The FBI never had Apple UDIDs.
The FBI replied to the claims yesterday calling them "totally false" and that they were never in possession of Apple UDIDs anyway. As if the FBI's word on the matter wasn't confirmation enough, Apple today responded to the rumors, telling AllThingsD:
“The FBI has not requested this information from Apple, nor have we provided it to the FBI or any organization. Additionally, with iOS 6 we introduced a new set of APIs meant to replace the use of the UDID and will soon be banning the use of UDID."
So it appears your UDID is safe, at least until they get transformed when iOS 6 drops later this year.