Good cable modem tcp/ip optimizers?

Factual Questions
1

Any good programs out there that optimize tcp window size and stuff like that to function ideally with a cable modem on win 2k or xp?

2

Some sites that may help:

http://www.download.com/3120-20-0.html?qt=mtu&tg=dl-2001&search=+Go!+

http://www2.kansas.net/drtcp.asp

http://www.bandwidthplace.com/phpBB2/