Does the said page have an RSS feed? Many pages nowadays do. look for the little orange RSS icon or a little orange radio wave icon. If there is an RSS feed you can use any number of programs from Safari to My Yahoo to track site updates. The BBC has the best info about RSS feeds that I've seen http://news.bbc.co.uk/2/hi/help/3223484.stm#whatisrss
na, that is RSS
here is the link to firefox 2's microsummary http://wiki.mozilla.org/Microsummaries/Using
basically, it will update title in your bookmark once the target page has new entry.