Like most operating systems, MacOS X doesn't come out of the box to take full advantage of a high-speed, broadband internet connection. Luckily, because of its Unix base, there's an easy fix for that. By making certain tweaks to your network settings, you may be able to almost double your download speeds.

Broadband Optimizer works by increasing the memory buffers used for TCP transfers, so that data comes in bigger chunks at at time - Man-sized broadband chunks, not modem-sized kiddie chunks.

Requirements:
OS X 10.3
PPC

Limitations:
Project has been abandoned.