For all those space based solar power enthusiasts that I know are out there you might be interested in Reaction Engines’ report Solar Power Satellites and Spaceplanes: The SKYLON Initiative.
It is one of a number of updates to the website in the latter half of this year that has seen a flurry of activity for the small UK firm, including opening a new factory, moving offices, acquiring engineering companies and REL founder Alan Bond’s Royal Aeronautical Society Brabazon lecture
For keen followers of the single stage to orbit Skylon vehicle there is also a user’s guide for the C2 version of the spaceplane on the REL homepage. However Hyperbola understands that a D1 version is in the pipeline with substantially more capability. Go here for more technical detail about Skylon technical issues