Here's something non-Valve related for a change of pace. Bioware have released The Revelation, an 8-page online comic for Dragon Age, created by fan Irma Ahmed (aka Aimo) and and Lead Writer David Gaider.
Aimo, as well as being clearly a huge fan of the game, is a very talented artist. Check out her DeviantART pages for various Star Wars, LotR and Dragon Age fan comics/art. Her official site is here.
Thanks to hedjeroo of Ashteroids for the heads-up.