Won't pretend to be knowledgeable about this area, but have two teenage nephews who are experts, so I'll pass along some of their book recommendations and favorite websites.
New Science Fiction Must Read - October 2010
Strong recommendation for The Half Made World by Felix Gilman from my 18 year old nephew who raced through it this weekend. Book jacket describes it as: "A fantastical reimagining of the American West which draws its influence from steampunk, the American western tradition, and magical realism."
Oh yea, Ursula Le Guin also gave it a great recommendation - "gripping, imaginative store, terrifically inventive setting, a hard-bitten, indestructible hero and an intelligent fully adult heroine - we haven't had a science fiction novel like this for a long time." Released Oct 2010.
Games Workshop featuresbooks, gaming, community, videos and other tools for fans of Warhammer, Warhammer 40,000 and the Lord of the Rings.
Also includes Specialist Games, such as Epic Armageddon and the lovely-named Blood Bowl.