Becta used to have a page on ICT room layout and design. They have cleverly lost it even though it was extremely useful - well thought out and throughly researched.
But, I have now found this information. Check out
http://www.comproom.ltd.uk/ourresearch.html
think the website is made by the guy who did the research - ex Head of ICT. I found it useful when designing my own room.
"Has anyone figured out what to do with bench corners yet? We're having a new ICT suite built in our new building, which will have benches around three sides of the room. That's two corners which are effectly "dead space". What's best to do with them? " - David Hicks
The research tells you what is the best layout - from a teacher's point of view. Meaning you can get rid of these "dead spots". There are layouts that don't have "dead spots" - easy!