I don’t claim that Lousy Book Covers is instrumental in all of these cases (I only know of a couple), but it still should be noted: All of these books have gotten new covers since they were originally noted here.  Some of them really aren’t an improvement, but…

• Fireworks on the 4th (original here)
• Wolfen: Bloodlines (original here)
• Marblestone Mansion, Book 3 (original here)
• Her Accidental Angel (original here)
• All I Want For Christmas Is a Werewolf (original here)
• Beast of War (original here)
• The Poverty Cookbook For Beginners (original here)
• Hidden Objective (original here)
• Bullet Blues (original here)
• Legacy of Ghosts (original here)
• Darkin: A Journey East (original here)
• The SteelMaster of Indwallin (original here)
• Erotic Refugees (original here)
• A Hummen in Spiral Gorge (original here)
• Shieldbreaker: Road of the Sword (original here)
• City of Rogues (original here)
• Good Luck, Fatty?! (original here)
• Aphrodisiac (original here)
• Darkin: The Prophecy of the Key (original here)
• Lumberjack in Love (see original here) — It turns out this was meant as a parody, but author Penny Watson discovered (especially through this site) that a lot of people understood it as earnestly bad.  Thus the change.
• Crystal Fire: Tales of the Crystal (original here)
• Sins of the Father (original here)