How do I launch Bonjour? I'm a complete Apple newbie - just bought my first mbp two days ago.

I'm trying to connect to my WD my book live NAS (working fine under my existing Linux set-up). The set-up instructions from WD tell me to launch Bonjour from Safari - but I can't find any reference to Bonjour in Safari - or any where else, for that matter!
You have to include it yourself. In Safari go to 'Preferences' > 'Advanced' and select "Include Bonjour" where you wish to - either in Bookmarks or in your Favorites bar.