I would like to be able to mark items that I am interested in. Then I can monitor them a lot easier on one screen. What I do now is either write them all down or actually put in a minimum bid so I can watch it in my winning bid screen. Sometimes I want to watch two or more similar items to see how they are rising in price so I can bid on the lowest one.
That would be great for those of us working on a tight budget who can't afford to drop a huge bid on an item just to follow it. A simple "follow" checkbox or something like that would be good enough.