E-Ink or LCD: Which Do You Prefer for Books?

Amazon's Kindle Fire HD is being pegged as a do it all device. Video, internet, magazines, games, etc. And of course, there are books. But I'm not sold on LCD screens for hardcore reading. Sure its fine for a magazine article or two, but when it comes time to sit down and read dozens, if not hundreds, of pages in a single sitting, i prefer an ereader every time. It's just easier on the eyes. Am I crazy?