As neat as the accelerometers on the iPhone are for switching between portrait and landscape modes, it gets to be annoying as hell trying to read when you’re lying down. You naturally hold the phone sideways when you’re lying down, and then the screen rotates, turning the text 90° away from you in landscape mode. You rotate it back and it rotates the screen 90° away again. The makers of the eReader application have already noticed this was a big issue and corrected it with a lock orientation setting. Safari, however, still does not have this.
I just figured out a workaround: lie down and turn the phone horizontally so that it goes into landscape mode. Then, continue rotating the phone upside down. Unlike the photo application which will display photos upside down, Safari will only rotate 270° and will remain in landscape mode, so you can comfortably read google reader in bed.