Desk placement that ISN'T facing the wall. This is similar to my office layout. And notice the heating vent behind the chair? In my office it's a radiator. This might be a good idea.
leftover by AMM blog, via Flickr
Small home office area or homework space for kids. Cut table to have it meet with bookcase. Could do this as a peninsula from wall too.
I Love Dust office by 44th Hill, London
Unit B4 / Make Creative