Here's my picks...
Devin Grayson's Teen Titans run
Jay Faerber's Teen Titans run
The Last Laugh
The Millenium Giants arc in the Superman books
Genesis- what in the name of God was Byrne on?
Stan Lee's Just Imagine- I stopped after the third one, Superman, I think. 'Course, I suspected it might be bad after reading the Batman one. I mean, you would've thought Stan Lee would know by now that pro wrestling is fake!