Hi there, I am also a relative novice on Android and have just got my Motorola Xoom. Same issue, am unable to get the contacts to sync anywhere.
Other forums suggest rooting the tablet and somehow transferring from a rooted android operated mobile phone, given that I only found out what rooting means yesterday not really an option for me!
I contacted WhatsApp and here is their reply verbatim
"Hi,
Thanks for your message. Sorry, we don't support tablet devices for WhatsApp.
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Best / Un saludo,
Cristina"
Any assistance for a non tech guy like me would be much appreciated