The Suvudu Free Book Library has the first book in 5 different series available for download. They have some books that sound pretty good available too:

• Blood Engines by T.A. Pratt
• His Majesty’s Dragon by Naomi Novik
• Settling Accounts: Return Engagements by Harry Turtledove
• Red Mars by Kim Stanley Robinson (really want to read this)
• Assassin’s Apprentice by Robin Hobb (the first book in one of my favorite series)