@Emil:  I've added The Iron Dream to the Banned Science Fiction & Fantasy Books list.  Thanks for pointing that one out.

@dd: Nothing makes a book more appealing to a child, or an adult for that matter, than sombody telling them they shouldn't read it.

@Emil:  I loved The Iron Dream, such a brilliant satire!  I think I read somewhere that Spinrad wrote it as a poke in the eye to the writers and eager consumers of crude, macho, wish-fulfilling pulp sci-fi/fantasy.  The "poor" writing was deliberate, as was the use of a despicable protagonist who is nonetheless a perfect exemplar of the Joseph Campbell Hero.  Since you liked this one, you should try to get Spinrad's novella collection Other Americas.  It's hilarious.

@Scott:  Nice links - it's sort of like the Streisand Effect!  It sounds like the same sort of people who oppose the teaching of "higher order thinking skills" because it might challenge "student's fixed beliefs" and undermine "parental authority."

Another Nazi related genre book that's been banned is David Britton's Lord Horror (1990), published by Savoy Books.  In fact, it was the last book banned under England's Obscene Publications Act.  It features the eponymous Lord Horror (based upon William Joyce, English fascist and Lord Haw-Haw for Nazi Germany) as a psychotic philosopher in a surreal alternate universe.  Britton was imprisoned for it's authorship, and most of the copies of the book were destroyed (it has never been reprinted).  Not one to take things lying down, Britton responded by writing an in-your-face sequel, Mother********:  The Auschwitz of Oz (ironically, the forum censoring software prevents an accurate transcription of the title ) (1996).  Here's an interesting history of the book, and here's an excerpt (and here's a small piece that io9 did on it).  It's a disturbing but excellent book, and should be considered for the Banned Book list.