Like some of the folks above, I work from home for an IT company. I have a company issued laptop and a personal desktop.
While my company is pretty progressive and gays/lesbians are protected under our diversity policy, we have domestic partner bennies - etc., my personal feeling is that I'd be disrespecting my company doing anything not work related on the equipment they provided for me to work on. Social networking, gaming, etc.
So, instead I have become the Queen of Multitasking between 2 machines at all times...