Not sure how I missed this, but Black Library has announced their upcoming Print-on-Demand service to allow people to order out-of-print books.
From their website:
As previously announced at this year’s Black Library Live!, Black Library will be launching a range of Print on Demand titles in January 2010 to bring back classic and fan-favourite novels, graphic novels and artbooks that have been out of print for many years. Most of these titles will be brought back through this special service whilst a few will have minor edits to reflect changes to the background of the Warhammer and Warhammer 40000 worlds.
This move also comes with the news that they will be reprinting older Warhammer and Warhammer 40000 that break the continuity of the current worlds. These titles will be published under the Heretic Tomes banner.