If you want better download speeds on Vista open up a command prompt as an admin and issue the following commands:

netsh interface tcp set global autotuning=disabled
netsh interface tcp set global chimney=disabled
netsh interface tcp set global rss=disabled

Here are my before and after results!:

Before:
Download Speed: 253 kbps (31.6 KB/sec transfer rate)
Upload Speed: 702 kbps (87.8 KB/sec transfer rate)

After:
Download Speed: 418 kbps (52.3 KB/sec transfer rate)
Upload Speed: 711 kbps (88.9 KB/sec transfer rate)