I occasionally blog at work. I find it relaxing to step outside the craziness on my desk and take some time to focus on writing.
When I'm home, I'll blog anywhere. The sofa, my bed, the deck. The one thing I don't like is a lot of noise distracting me. Mostly my home is quiet, and I can go anywhere and find enough peace to crank out a little inspiration.
When I hit a blogging wall, I usually turn on the TV, or get out of the house to distract myself. Going to the gym, or a walk, or just a drive will clear my head enough and get me back on track.
Of course, then I'm not near my netbook. That's when I start sending emails to myself on my phone with blog ideas.