Workstations I have tried

Typing on the netbook while sprawled on the couch, often belly-down.

My current favorite and no doubt an ergonomist's worst nightmare.

Typing on an external wireless keyboard in my lap (keyboard trays are rarely at friendly heights for shorter folks) and the laptop propped atop the Oxford American Dictionary on my desk to get it up to a non-neck-craning altitude.

As my thickest book, the OAD has since been re-purposed. And people claim they don't need physical books any more! Anyway, this is probably the closest to your standard computer desk setup.

Sitting on the carpet and writing longhand in a notebook on the coffee table.

Koreans are generally comfortable sitting on the floor, so this feels right in a way. But the coffee table's too high to type on, and my handwriting muscles seem to have atrophied from too much computer use.

My netbook on the dining room table and me several yards away on the couch with the wireless keyboard on my lap, unable to see what I'm actually typing.

An extreme form of "don't edit as you write," I suppose. There were complicated reasons for doing this, and I don't expect to do so again.

Netbook on the waist-high bookcase, standing as I type.

My officemate at work actually uses a standing desk. He really loves the setup and claims that being a bit more physically active also helps his mental processes flow better. (I'm mostly grateful because while he's standing, he shifts around enough to satisfy our motion-sensitive ceiling lights, which otherwise like to plunge us into darkness when we sit still too long.) So this is experimental.

I've heard that it's a good idea to have a special writing place in your home, perhaps the same way sleep hygiene works (make sure your brain associates your bed with sleeping by only using it for such). Clearly I'm not a follower of this practice. We'll see how the standing goes.