Right now I have a HTC mogul ... on metropcs fully working, and a Netbook Asus EeePC 900a
running ubuntu netbook remix, to tether your phone is very simple,
first on my phone I am using Ryan's mogul ROM and it has an app called Internet Sharing,
Open that app and select USB and press connect, then plug it to the laptop/netbook/pc and on Firefox/opera/IE change the proxy to wap.metropcs.net port 3128... and Voila
of course the settings will vary from carriers but basically that is it
hope I helped someone