Reddit reviews Diary: A Novel

I'd add Palahniuk's SURVIVOR too - it's written like a diary, as a man uses the cockpit recorder to explain why he's hijacked a plane and is about to crash it...:

>Tender Branson—last surviving member of the Creedish Death Cult—is dictating his life story into Flight 2039’s recorder. He is all alone in the airplane, which will crash shortly into the vast Australian outback. But before it does, he will unfold the tale of his journey from an obedient Creedish child to an ultra-buffed, steroid- and collagen-packed media messiah. Unpredictable and unforgettable.

(ETA: It's in Italian! )

Oh, and of course DIARY!

>Misty Wilmot has had it. Once a promising young artist, she’s now stuck on an island ruined by tourism, drinking too much and working as a waitress in a hotel. Her husband, a contractor, is in a coma after a suicide attempt, but that doesn’t stop his clients from threatening Misty with lawsuits over a series of vile messages they’ve found on the walls of houses he remodeled. 

>Suddenly, though, Misty finds her artistic talent returning as she begins a period of compulsive painting. Inspired but confused by this burst of creativity, she soon finds herself a pawn in a larger conspiracy that threatens to cost hundreds of lives. What unfolds is a dark, hilarious story from America’s most inventive nihilist, and Palahniuk’s most impressive work to date.

If you haven't given Chuck Palahniuk a try, you definitely should.

From Diary. Turns out there's also an audiobook version of it on Youtube. Link.