"Hansard's Guide to Refreshing Sleep" and other works of fiction...

Canis Iratus posted (admittedly, some time ago) a wonderful list of Famous Books That Never Existed (ok, he called it, "The Least Dangerous Books of All Time", but both lead the same path). Hansard's Guide, for example, was a set of spines that Charles Dickens used to cover up some woodwork in his library. There are some great titles included...

I remain unconvinced that The Pnakotic Manuscripts are "fictional"...but time will tell. Just in case, I say:

Cthulhu in 2008 - Why Choose the Lesser Evil