I am ALMOST always out in the living room, on the right side of the couch (because that is where the most available plugins are xD) with my legs crossed on the cushion, and the laptop in my lap. Sometimes, though, my legs get uncomfortable so I stretch them out and rest my feet on the table. xD
There are two other normal spots for me on the computer though. Sometimes, I am on my bed, and if that is the case I am either laying down with my laptop on my chest, or I am sitting up with my laptop on my lap.
And if I am at the church with my mom for her job, I am in the back room of the office, laptop on the portable table, sitting in a chair, leaning on the table.