I know: we the DSUP cabal have been neglecting you quite seriously of late. Some of us have been looking for jobs; some of us are finishing our dissertations; and some of us have been caught up in a combination of various offline events and changing our operating system three times. (Somewhere, Commenter Nick is laughing.)
So as not to neglect you, I bring your attention to Sustainable Energy--Without the Hot Air, a work-in-progress by David MacKay, a Cambridge professor. There's also a blog and an article in The Register -- the two are related, as MacKay uses his blog to correct some of the impressions a Register reader might get. The nice part about MacKay's work is that he puts it all online, so you can download it, examine it, and argue with it at your leisure. Note that you cannot just read the four-page executive summary and get his full conclusions that way; I tried that already.
(Link originally found at Arts & Letters Daily, though, strangely, not at its sister site, Climate Debate Daily.)