Marvel Comics has released a Halo graphic novel (Master Chief is now as much a super hero as SpiderMan, the Fantastic Four, and the X-Men!!) - you can preview the graphic novel on the Marvel Comics web site.
ComicIcon has more information about the novel.
The HALO Graphic Novel
Written by Jay Faerber, Brett Lewis, Lee Hammock, and Tsutomu Nihei
Illustrated by Simon Bisley, Ed Lee, Tsutomu Nihei, and Moebius
Gallery art by Rick Berry, Geof Darrow, Scott Fischer, Sterling Hundley, Craig Mullins, Tsutomu Nihei, George Pratt, Juan Ramirez, George Staples, Justin Sweet, John Van Fleet, and Kent Williams
Dust Jacket by Phil Hale
128 pages/Rated 17 and Up/$24.99
Which then leads nicely onto the movie... IMDB shows the Halo movie being released in 2008 - Who do you think is going to be playing Master Chief (or doesn't it matter since you're probably not going to see his face!).