I haven't seen any threads over here challenging Steven Grant on his statements in his last Permanent Damage that 2008 was a lackluster year for this medium. I think that in terms of original graphic novels, 2008 was actually stronger than 2007.
Great graphic novels of 2008: Alans War, Acme Novelty Library volumes 18 and 19 (both are independent of each other), What It Is, Judenhass, The Number, American Widow, Too Cool To Be Forgotten, Burma Chronicles, Breakdowns (okay that wasn't all new, but it's new to most people), Life Sucks, Alcholic, Me and the Devil Blues, Solanin, Real (well the last three books aren't new in the strictest sense, but they're newly translated mangas), and FreakAngels (again it's new in the printed format). Best anthology of the year was Comic Book Tattoo.
This past year also had some great reprint collections such as the Howard The Duck and Tomb Of Dracula Omnibus' and the Harper Collins Zot collection.