Apple released Broadband Tuner 1.0. It adjusts the TCP send/receive and socket buffer, intending to let Mac OS users take the full advantage of their high speed broadband (with high latency).
Of course you could adjust the system variable with sysctl (under root authority) if you know how to do it. The Tuner basically changes the following parameters:
Why Apple released the broadband booster now, that they could have done it long time ago? Pushing for more iTunes downloading?
What's next for Apple? - Jan 14, 2006
MacBook Pro - Jan 11, 2006
"Real" Windows Vista - Jan 10, 2006
Macworld San Francisco 2006 - Jan 10, 2006