Comic Book RPGs appears to be the latest indie developer seeking to satiate our thirst for role-playing games, having just released both a PC and Mac demo for their debut title, Immortal Souls. According to their website, the game is a Flash-based comic book RPG featuring "two vampires fighting to save their souls from the legions of Hell", and the team is already preparing to release it on December 1st. If that sounds like something that might be worth $10 to you, you can start with these two promotional trailers:
The demo is also available from Fileshack and AtomicGamer, if you'd rather download it elsewhere.