My current writing space is composed of a very low coffee-table. This is actually a kotatsu - a special table that you put a blanket over and plug into an outlet to turn into a mini human oven, in which you sit all toasty during winter and watch tv. However, I've gotten rid of the blanket, pulled out the electricity connection and turned it into an ordinary coffee table, which I use to hold papers, cups of tea, remotes, files, dictionaries and my laptop.
It sounds odd but the whole arrangement's not too bad. Because my sofa is also very low, the table is at precisely the right height for typing. Which is good given that I spend a lot of time doing exactly that. And, all my necessary stuff is on the table so I don't have to reach far to find a thesaurus, or a file holding my notes on a project. The confined working space also has the side-effect of making me stay fairly tidy - the second the creep begins, I start not having enough space for my laptop or books and have to clean up.
Of course, all this doesn't mean I don't dream of a huge wooden desk where I can sprawl to my heart's content!
What's your writing/work space look like?