Given that Sabu is widely regarded as the de facto leader of lulzsec I'm very curious about how the Stratfor attack was planned and undertaken. If, as seems likely, the FBI knew about it before it happened that seems pretty serious. More so, if Sabu originated the idea for the attack and evangelized it to the group that raises the issue of entrapment.
I don't know much about the attack, but the data seem to be 100% legit and really hacked from the Stratfor database.
My wild guess is that Sabu was not responsible for the idea, but was instructed by his FBI supervisors to just play along and help people with the attack to build up credibility. Meaning - the feds didn't modify the data at all, they probably just used the server to track down the IPs.
Anyway, the fact that Sabu was an informer is surprising to me, a lot. Especially when he was still posting tweets, accusing OTHERS of being informers.