Here's an interesting attempt to break the light speed limit reported in The Economist:
Parts of a light wave can be accelerated beyond this speed by passing the wave through a vial of energetic potassium atoms. On the face of it, this contradicts Einstein's special theory of relativity. So, rather than saying as Einstein did that nothing can be faster than the speed of light in a vacuum (abbreviated as c), physicists now prefer a more precise version: information cannot travel faster than c.
Ultimately, Einstein wins out, but Tony S at Technically Speaking (a great new blog) thinks that eventually Einstein will end up like Ptolemy who's earth-centered universe was also long considered the conventional wisdom.
Others have looked at light's speed as being less than inviolate, including Joao Magueijo who's Variant Speed of Light theory is explained in his book, Faster Than the Speed of Light. It's an interesting book, although Magueijo comes off as a real jerk. His theory, conceived in the throes of a hangover, challenges inflation as an explanation for the behavior in the early universe.
A better science book in the stores now is Sync: The Emerging Science of Spontaneous Order, by Steven Strogatz. I didn't completely get the connection between the different kinds of synchronized behaviors he described, although each in itself was interesting. The chapter on circadian rhythms and sleep disorders was worth the price of the book alone.