I have pretty extensive contacts list on my iPhone, which I would like to transfer to my iPad as well.
Did you manage to sync the contacts using suggestions above? Let us know if you need any further assistance.
You can also use Google Contacts to sync them across all your devices.
Thinking outside the box ~ you could also use Bump to transfer them
Mobileme gives you a 60 trial. With this app you can keep all your contactsin sync all the time using the cloud.
When you sync your iPhone, in the tab do you have "sync contacts with iTunes" checked? If so, they're in iTunes and you can transfert them to your iPad.
connect to iTunes, sync iPhone after clicking contacts etc, then connect the iPad and after clicking sync with outlook )
How to Sync Your Contacts with an iPad
Also you can sync your iPhone contacts with gmail or yahoo. Then when you sync your iPad, have it sync with the correct account as well.
Or you can get Mobileme and have the contacts sync over the air.