ZYB is a web site that allows you to synchronise your mobile phone and store your contacts and calendar online. I found it via Kevin Kelly’s Cool Tools and took a look. It is quick and painless to set up and should prove very handy if I ever lose my phone or it gets stolen, something that happens far too often in South Africa. It will also be useful when I get a new phone as it will allow me to transfer my contacts to the new phone. Besides this it also lets you share your calendar and contacts. Basic use is free and if you have your life on your phone and dread losing it, you may want to take a look.
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craniac's place 
Simply wonderful. I like sharing feature the most, though the backup is a prime requirement of every mobile user but sharing saves from a lot of hassle.