Already preordered 2 retail copies for £45 each. Have used Windows 7 Beta/RC on laptop since release.
Will put one copy on my laptop, and not sure if I'll use the other on my PC. I don't really see too much of a benefit to warrant me losing the money I could get from selling it in January when the retail price will be £149.
I haven't selected any of the poll options since they all require you to be really eager to switch or not switch at all. Only reason I'm going to install W7 on my laptop is because of SSD support and the fact that it won't have a legal OS otherwise.