I hope you're right, that there is something here, but note my post 60. If Saban was the "agent", there's something seriously amiss here. The fact that an American citizen is both a major donor to the Democrat party and pro-Israel doesn't equate with his being a foreign agent. There's some potential political embarassment here, and not for the dems. Still, we have to wait for the facts to come out.
Even if he is the guy on the other end of the call, "maybe, maybe not" as to propriety of the search. W/O background justification, there's no way to tell. For all we know, the search was undertaken with a court warrant.
As for the source of the instant leak, most of the scuttlebutt I've found is looking at Rosen, and the pending espionage trial.
See Is AIPAC imploding? Why Steve Rosen is Suing AIPAC (April 11, 2009) and Dissident Voice : Why Steve Rosen is Suing AIPAC (April 8th, 2009)