I dont know S#!t about S#!t.. except S#!t of course. I know alot about S#!t. Anyway I am hoping one of our smart mods coughnotmecough will get some going and post a guide. 

TweakVI Basic
Vista Boot Pro
Vista Tweak
Vista TCP/IP
Vista Internet Tweaks

I am working on a dual boot linux vista machine today..  Our book store finally got our copies in..  A whopping $40 for an upgrade to vista ultimate.

Here is some information I posted in another topic
http://www.testmy.net/t-20201
Try these
netsh int tcp set global ? (This will list the setting options)
netsh int tcp set global autotuninglevel=normal (This is an example )
netsh int tcp set global ? will show you the available changes
netsh int tcp set global autotuninglevel=normal is probably the way it is now.
Try experimental then disabled if experimental doesn't help.
On the others set to disabled or none then try default one at a time & check to see if you get a speed increase .Unfortunately you have to experiment for the right combination.& you might want to reboot in between changes.
netsh int tcp show global will show your current changes
These are put in the command prompt run as administrator
This is about all I have found .

::::::::::.. Download Stats ..::::::::::
Download Connection is:: 20900 Kbps about 20.9 Mbps (tested with 12160 kB)
Download Speed is:: 2551 kB/s
Tested From:: http://testmy.net/ (Main)
Test Time:: 2007/09/11 - 10:44am
Bottom Line:: 364X faster than 56K 1MB Download in 0.4 sec
Tested from a 12160 kB file and took 4.766 seconds to complete
Download Diagnosis:: Awesome! 20% + : 228.77 % faster than the average for host (Cox.net)
D-Validation Link:: http://testmy.net/stats/id-HF2Y7WVKP
User Agent:: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6

that I breaks barrier of speeds that I have Cox premier 12Mbps but breaks barrier into 20Mbps, I am running away with it to blows normally users away. Japanese are running around circles of America broadband LOL