[robg adds: To make this work, you'll need to visit the Speech System Preferences panel, and turn on Speakable Items. Once that's done, use Safari to visit the website you'd like to voice bookmark, hold down the Speech recognition key (Escape, unless you changed it), and then say Make this page speakable. When you do so, and the command is recognized, a dialog will pop-up, asking you for what to say to activate the current page. Enter a short, memorable and easy-to-pronounce phrase for the page you're visiting (cnn.com is "the news," for instance) and click OK. From now on, you can load that page by simply holding the speech recognition key and speaking your phrase. This works in both 10.3 and 10.4.
Unfortunately, since I usually have iTunes playing all the time, voice recognition isn't of much use. What should happen, I think, is that iTunes should mute its output as long as the speech regonition key is pressed. If that were the case, I would probably use speech regonition at least occasionally for key web pages and other apps such as Address Book.]

