Right now, I'm happily devouring Reality Deviant Production's True20 product, Shadows of Cthulhu. Since I received this Friday, I've missed out on a good bit of sleep reading through it, and I'm happy to report it looks like Reality Deviant has done a really nice job porting over the staples over H.P. Lovecraft-inspired gaming to True20. Its got me seriously jonesing to run a Roaring '20s one-shot full of Things Man Was Not Meant To Know (and to introduce an entirely new generation of roleplayers to lines beginning with "But Professor!").
I should be doing a little tie-in project on this with Atomic Array a bit later on in the week, so stay tuned for that.