How can we categorize Banksy's work -graffiti or murals?
I'd say they are graffiti murals to be sure, with a pinch of Guerilla Art. Yeah that's what I said.

I had this kick ass book at home on it but its fading in the 405 at the moment.
check it: http://www.concepttshirts.co.uk/guerilla-art.php

Research Banksy's work to attempt to answer this question.
What are some of the differing opinions about Banksy's work?
I couldn't find too many official published work on his pieces. What I've found on Bansky is mostly rants, rants by bloggers and pretenders. I feel quoting another blogger directly is like resourcing wikipedia. So I'll paraphrase instead, some think his work is a cry for publicity. Works like the blow up doll of Guantanamo prisoner in Disney Land, and his piece on the security wall between Bethleham and Jerusalem, support this accusation. However, I disagree. Other than that the world seems to turn a blind eye to this masked vigilante. You want my opinion? Bansky's work is absolutely lovely.

http://hoipolloi.wordpress.com/2007/12/04/publicity-stunt-or-graffiti/

How does his work sit in relation to consumerism?
To begin with it's 'street art', 'guerilla art', 'graffiti', 'defacement of public property', 'tagging' there aint much more temporary than that. My generation has been labeled as "the instant gratification generation". Translates something to the tune of "live today for tomorrow we die". This first world western empirical society which exists is the epidemy of consumerism. The ephemeral nature of Bansky's work embodies through its progressive and controversial messages, consumerism in its mature development.

Can his work be sold?
There are works being sold online now, actually, but they are not really Bansky pieces. So no. Im going to go with a no.

What are some of his attitudes to the sale of Art?
Sarcastic.

Who is Banksy?
That question it seems, is debatable. I think we are all a little Banksy sometimes. Hopefully.

Do we know his true identity?
Ive come along about 5 different Banskys, and as to which is the true Bansky I couldnt say.

Upload 2-3 images of Banksy's work that you find interesting, and comment
on the ideas behind the work.