Your answer about long/short urls is for posting your own but other peoples' make horizontal scrolling required. Sometimes, the text doesn't even fit across the screen at all. Makes it really hard to read.
Agreed, I have copied out the text of horizontal scrolling threads into MS Word in order to make them readable. I wish this wasn't necessary and that everybody would use the alternate means of adding a long URL as Arron suggested. It only takes a few extra keystrokes and would make reading these threads so much easier. Another option would be to use a service such as http://tinyurl.com