The Elvidge Family

I use different computers at home, work and have two laptops. Foxmarks is an easy to use firefox addon that will automatically keep all your bookmarks up-to-date. Just google search for 'Foxmarks' and install the plugin on each computer.
For added security (if you decide to also synchronise passwords) make sure you set a master password in Firefox (Tools - Options - Security - and select 'Use Master Password' )

NB: Foxmarks has now been taken over by XMarks which is now compatible with other browsers (Opera & IE) and can also securely synchronise login details.