Script by Alan Moore, art by Kevin O'Neill with Ben Dimagmaliw and William Oakley.
This beautiful oversized slipcase (8.5 x 12.8 inches, 21.5 x 32.5 cm) designed by Kristy Quinn was published in 2005 by Wildstorm (ISBN: 1-4012-0611-5, cover price 75$) and features two faux leather with dust jackets books: League of Extraordinary Gentlemen Volume 2 and Scripts (224 pages in each book). It is printed on glossy thin paper (perhaps too thin though, but this is a very small detail compared to the richness of this edition).
First book: apart the 6 original comics books, I think there is some exclusive illustrations drawn for this edition by Kevin O'Neill, but since I don't own all the previous paperbacks I can't be sure if all the things I point out here as such are really new material. One of the picture below is for size comparison between this absolute edition and the original comic books.
For the second and third of covers, illustrations are exclusive to this edition.
After the main story we have the 5 back covers of the original comics, one page of retro adds and The New Traveller's Almanac introduced by exclusive illustrations.
The bonus section continues with The Game of Extraordinary Gentlemen printed in A3 fold size (originally published in America's Best Comics 64 page giant ), followed by the original covers for the floppy and bumper compendium edition (again introduced by a new illustration). The book finishes with 8 pages of bonus material probably from previous paperback (or exclusive to this edition).
Second book, the scripts. Second and third of cover are inked but not coloured drawings from the main story (where one's can see that Mr O'Neill is one of the most fabulous illustrator of our time).
Obviously this second book contains Alan Moore's scripts for the second series, but it also features some layouts by Kevin O'Neill (and along the scripts pages in transparency, the finished artwork before colourization). There is again a few exclusive illustrations.
At the end of the book there is a selection of sketches and pencils layouts (4 pages) and a last exclusive illustration.
The collected LOEG absolure edition so far:
Link to absolute Vol 1
Link to absolute Black Dossier