In the computer management console under XP and 2k its possible to go into the llist of running services and stop or disable them.

start>control panel>services. You can then stop services you wont need if not connected to the internet.

Such as..

DNS client
Internet connection
Net logon
Net meeting remote

and this one i just saw... WTF is it? i dont know.. techmouse???

"MS Software Shadows CopyProvider... sound dodgy to me...

Portable Media Serial Number
Print Spooler
TCP/Ip
Telnet
Telephony

Theres other as well in that list, but be careful, not all the glitters is gold and a lot of these services you will need to run your machine properly... but some of them you can get rid of.

Anyone care to chip in with negatives/positivs? I've personally never had a problem, but then each user is different as is each machine.

HTH