[probably]

He's been a controversial figure in many forums but his emacs lisp tutorial is the best out there. I gave him a donation through Paypal (for approximately the price of an O'Reilly book) and he personally sent me an email thanking me.

[lispm]

unfortunately his knowledge of basic Lisp is relatively small and his Lisp style is also quite bad.

He does imperative programming in Lisp:

   (let (a b result)
     (setq a 1)
     (setq b 2)
     (setq result (+ a b))
     result)

code which is more than four lines is often from different sources.

[probably]

Well, looks like he's got ads on his site now which I suppose takes place of the donation button.

[agumonkey]

Not sure but I think it's an emergency measure to sustain income.