One of my favorites is Communication with Alien Intelligence, wherein he attempts to demonstrate that it will be possible for us to communicate with any alien intelligence we meet

Oh, that interests me tremendously.

If natural evolution produced intelligence with only physical sensory input, why couldn't an artificial intelligence be achieved with only software, some motors, and a camera?

I think Heylighen's point is that you would need an entire system of artificial intelligences to evolve together in an environment - you can't just have intelligence "arise in a vat" so-to-speak. So he is arguing that the natural system-intelligence of the Internet is a better candidate for superintelligence emergence than is robotics. Again, I'm quite committed to the perspective that robotics and the internet are going to both produce higher intelligence levels.

I think an artificial intelligence and the environment that produces it will be so complex as to make predictions implausible.

Fair. Of course.

"We can give you anything you want, save relevance."

Wow, one of my favourite quotes now. Thanks. I'd be scared of it if I didn't think that we will be that intelligence.