Revisionism in History - Holocaust Revisionism - Guide to Evidence - Consequences
Yes. We have Richard Harwood's Did Six Million Really Die? (1974 revision)
http://www.vho.org/aaargh/fran/livres5/harwoodeng.pdf - this is a PDF version; many more formats are online. An overview piece, not immensely detailed, but surveying the entire subject.
[Inserted April 2015: listed variously as 3rd, 4th and 5th edition, 2014, attributed to 'Peter Winter', and retitled The Six Million: Fact of Fiction, this seems to be the same but updated book.]
And Arthur Butz's The Hoax of the Tentieth Century
http://www.vho.org/GB/Books/thottc/1.html (2003 edn - 1st edition 1976). This version is HTML format.
And Dissecting the Holocaust, edited by Germar Rudolf (1994; Eng. trans 2000)
http://fliiby.com/file/845909/xd1xpk2h5i.html in a newish online scrolling format.
And the vast revisionist website Historical Revisionism by Vrij Historisch Onderzoek
http://www.vho.org
And the website of CODOH, the Committee for Open Debate on the Holocaust
http://www.codoh.com founded by the indefatigable Bradley Smith.
_________________________________________________
David Irving's website is http://www.fpp.co.uk though his scope is enormously wider than just one single subject.
The Institute of Historical Review http://www.ihr.org started out with 'Holocaust' and Second World War material, but has expanded into consideration of (for example) worldwide American and other aggression.
_________________________________________________
I notice that one of CODOH's images includes the two-part supposed 'mushroom cloud', though it's not clear why, as their site is strictly holocaust only. CODOH has a forum, though not as well-designed as this one. One of its threads is Helpful Hints on how to 'Deny' the Holocaust which has some amusing but rather despairing accounts of strategies that might be used in trying to overcome in ordinary people the steel mind-trap of the 'Holocaust' - also known as the 'big H', the Hollow Cost, the holohoax. The educable percentage is put as low as 1% or even 0.1%. (The emailers don't address the even trickier issue of trying to communicate with 'experts' - something nearly impossible, because of their unwillingness to take risks.) The up-and-coming approach seems to be to say something like: "which of these events are you calling a "holocaust" - Dresden, Holodomor, the Gulags, firebombing Japan, famine in Bengal?"
The Holocaustiana listed above spans about 40 years. Maybe it's time for a nuke overview piece? In my opinion, a selection of overview comments is the best way to get people to start thinking: detailed stuff can wait. And try to encourage people to do their own work - there are just too many of them for individual tuition. And bear in mind that there was time when you yourself didn't know this material.