I can't think of the last time actually. But I'm feeling it looking at the Kindle, mainly because its screen isn't as big as a lot of the books I already have. Not even many paperbacks.

The borders around the screen are too wide on the new Kindle. Expanding the screen (proportionally) would fill in the excess space and provide more reading room. And of course the ability to simply make the text/print bigger.

In addition to a bigger screen it needs higher contrast and newer display tech to get the white portions of the page to really appear white. Full colour would be excellent for magazine reading, but I'm not even going that far yet. We can wait 4 more years for that.