I never got around to The Physics of Star Trek, but I did just finish Lawrence Krauss' latest book, Hiding in the Mirror, which is, among other things, a healthily skeptical look at string theory. (Check out the Amazon review comments where at least one string theorist makes his own case.)

Krauss' view is that, despite some recent hubris about theories that seemed to solve all the mysteries of nature, it turns out that there are some pesky questions that the most current Theories of Everything don't even begin to answer.

This article on dark energy takes note of one of those pesky issues.