In a post on his website, Monte Cook gives a "thumbs up" to d20 Call of Cthulhu, which he's seen an early copy of (makes sense - he co-wrote it). I've seen an earlier draft that was lurking around Chaosium, and if that version is any indication, the final book will look great, though I can't say I've read the rules yet. Anyway, Cook has written an introductory adventure for d20 CoC that will appear in Game Trade Magazine #26, due out in April. I doubt I'll be able to wait that long to give the new game a test drive.