One more thought. A lot of you are espousing the virtues of working from home. I worked for IBM for more than a decade. IBM does not provide permanent office space to most of its employees: especially if you are client facing. I was either on the road or working from home. I investment is a nice desk, top of the line printer/scanner/fact, dedicated phone line etc. I paid for all of this plus internet, print cartridges, paper etc. IBM wouldn't reimburse a dime.
The advantage to IBM, they are able to reduce a lot of office space and office supply expense. You are picking up the tab.
The advantage to me, I could wear shorts, didn't have to commute, and could get some chores done at home, if needed, during the day.
Here's the other reason your employer likes it. You will work a LOT more than 40 hours a week if you are at home. Your computer and phone will always find you. I'd worked from 0800 to 1800 every day. I'd break for dinner and help get my youngin's to bed around 2000. I'd be back at the laptop after they were asleep work until midnight. Your home life and work life are now intertwined. It's hard to disconnect. Studies have shown workers who work from home will work a lot longer than those who go into an office. Working from home isn't always a good deal.