Berlin's pretty good. I have the complete hardcover but haven't read what constitutes the third volume yet.
I tried reading Zot! but couldn't get into it. Another Scott McCloud book I have is Sculptor, hopefully that'll appeal to me more.
I'm currently reading the rest of BPRD (Hellboy), currently on volume 3 of "Hell On Earth". It's a lot better than "Plague of Frogs", which I didn't care for at all.