I'm sad to say I didn't.
The main reasons: I've yet to beat the first Corpse Party (I'm pretty sure I'm not even close to the end credits) and I'm still trudging my way through Elminage Original.
Also, I can't say I'm tickled pink about paying $19.99 for a digital game that likely would cost the same amount if it were given a retail release.
Still, I want it, and I'll probably pluck it from PSN sooner rather than later.
If any of you bought Corpse Party: Book of Shadows yesterday, though, I'd love to hear what you think about it in the comments section below.
For more information on this PSN title (which is perfectly playable on both the PSP and Vita, by the way), check out this blog post and this NeoGAF thread.