Scrolling back and forth to read each line sounds pretty broken to me. On the desktop, if I had something open in a small window I'd probably pull out Firebug and "fix" the css.
Personally I'm a believer in the original scheme where the site provided the content and it's largely up to the user agent to decide how to present it. This whole "Every rendering engine should create the exact same rendering of the page down to the pixel" is super useful for web apps and stuff, but most of the time I just want to read stuff. Honestly, I'm surprised there's no web browser that just runs the Readable scriptlet on any page that looks like an article by default.