Exactly what stealth said (as usual.... and she knows about baking - the woman is a genius :) )
I officially work 4 days a week, with no set location - I have a 'real' desk, in a 'real' office but sometimes don't see it for 2 weeks at a time as the company I work for is geographically spread across the UK. On the days I have meetings, I travel to wherever I need to be, and on the days I don't I either work from home or go to my desk....no-one watches or keeps track and I am measured by results (as long as I am available for meetings & conf call, no-one seems to care!).
I find I work much longer days when I am at home, and spend less time on MN, than when I am in the office....(like today...
)....Office days are about networking and catching up on gossip projects, or are spent in back-to-back meetings; home days are about 'getting things done'. I'm much more likely to take a lunch/coffee break if I'm in the office.
I do shut the door on the world when I'm at home, and refuse to be distracted by anything - all 3 dcs are totally used to me disappearing for a conference call with Asia at 8am, and understand that I can't chat when they come home if I'm working.
On the plus side, I love having 1 day/week where I can be a full-time mum, but I still get to have my career.
On the minus side, I frequently end up working for a large amount of my 20% non-work (unpaid) time, am definitely not being paid in line with my (male) colleagues at my level and probably haven't progressed my career as much as I would have wanted.
Office Communicator/MS Lync, Blackberries, Broadband and laptops have made flexible working a genuine option for lots of people, not just mums....but I think the flexibility is as much about choosing the hours of work (I often start with a conf call at 8am, but may not get to the office until 10.30am....or will leave the office at 4pm but spend 2 hours on a conf call during the drive home, and then do a few more hours after 9pm....) as location or days.