This is a problem for a lot of people. The design of the forums is really geared towards people with big monitors and high screen resolutions. If you are viewing the forums at 1024 res or less and someone posts a pic over 650 pixels wide, the text scrolls off the page.
There are 2 solutions, first would be to dump the right hand adverts, which would be my favorite but is up to Tony obviously, the second would be for mods to delete pics posted that are over 650 pixels wide.
Alternatively, if your computer can cope, turn the screen resolution up to 1280 pixels.