If there is one area where he differs from his predecessor, it is his anti-trust enforcement.

Another example of this is the pushback against the AT&T/T-Mobile merger, where FCC Chairman Julius Genachowski has come out strongly against the deal, and now has appeared to have killed it:

AT&T and T-Mobile USA edged closer to scrapping their proposed merger, saying on Thursday that they had withdrawn their application to the Federal Communications Commission to join their cellular phone operations.

Deutsche Telekom, the parent of T-Mobile, and AT&T said in a joint statement that they still intended to pursue the $39 billion merger and would prepare for a federal antitrust lawsuit that is seeking to block the deal. But the companies also said that AT&T planned to take a $4 billion charge against earnings to reflect the potential breakup fees that AT&T would have to pay Deutsche Telekom if the deal failed to go through.

The actions followed the decision this week by Julius Genachowski, the F.C.C. chairman, that the merger did not meet the commission’s standard for approval. Mr. Genachowski sent other commissioners a proposed order to refer the case to an administrative law judge, the first step toward a commission move to block the deal, which would combine the second- and fourth-largest cellphone carriers in the United States.

The application withdrawal appears in part meant to prevent the F.C.C. from making public AT&T and T-Mobile records about the potential effects of the merger, records that could then be used by the Justice Department in the antitrust trial.

The companies have maintained publicly that the deal would not lessen competition and that it would create jobs in the United States. But the Justice Department has said that the merger would severely restrict competition, and F.C.C. officials have said that AT&T’s confidential filings indicate the merger would eliminate jobs.

The withdrawal of the F.C.C. application “is a tacit acknowledgment by AT&T that this story is all but over,” said Craig Moffett, an analyst at Sanford C. Bernstein. “The fat lady hasn’t started singing yet, but she’s holding the mike, and the band is about to play.”

While Genachowski is still too timid for my tastes, compared to the Republican appointees, particularly the execrable Michael Powell, he is doing a creditable job.