Android on Laptops?

Putting aside the obvious - it's not designed for laptops, has anyone installed and used Android on a laptop, and what is your experience of it?

I did install Android 1.6 on a laptop a while back, but the performance was pretty bad (possibly due to the laptop being quite old). I can see pros and cons to it, it's never going to replace ones main laptop - but hey, for curiosity's sake!