Do you subscribe to the Apple MobileMe Cloud service and have an Apple MobileMe email account? If so, you can set 'Settings', 'Mail, Contacts, Calendars', 'MobileMe', and switch 'Bookmarks' to 'On'.
I have an Apple mobile me id (using my Apple ID) that I set up for the "Find It" feature.
So I need to take it further and "subscribe to Clouds"? I'll investigate further.