[Ichneumon]

It is faster than the speed of light -- which is why "expansion" is controversial.

Um, no. Expansion is not limited by the speed of light because it's an expansion *of* space, not the speed of something traveling *through* space. Only the latter is limited to the speed of light.

Some physicists speculate that the speed of light has been slowing down since the Big Bang.

The only people I'm aware of who speculate such a thing are certain young-earth creationists who are trying think up reasons why the obvious age of the Universe doesn't actually mean that the Universe is older than 6,000 years old...

[edsheppa]

The only people I'm aware of who speculate [that the speed of light has been slowing] are certain young-earth creationists...

Some reputable physicists also have speculated about changing physical "constants" as you can see here but the changes are minute.

[beezdotcom]

The only people I'm aware of who speculate such a thing are certain young-earth creationists ...

Actually, I'd imagine there are probably others, but of less notoriety.

One article suggests that c may indeed have slowed down...

However, there may also be evidence to suggest the speed of light has been speeding up...

Personally, I'd take the average, and call it a wash...