Found this at David Ascher’s blog, where he said :

It’s a brilliant paper about user interface design, or the lack of it. In the vein of Tufte, but much more applied to software. The tail end of the paper is a little too fluffy for my taste, and the paper would have been better without it, but that’s a minor flaw on what I hope will be an influential paper. I’ll try and get people to read it, but it’s too long for many.

It pretty much says it all. Don’t let its length discourage you from reading it.