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All of the American scotches and sweets are good for dipping. You pour them into the front of your mouth and use the tip of your tongue to shovel it into a little ball. Don't let it get too wet, but if it stays dry then you're not getting the nicotine. It takes practice, but the flavour is quite nice. Starr is maybe a bit too plain for me for dipping--it's not cured with hickory smoke at all--though it's great as a very plain nasal snuff.
African moist and dark snuffs like NTSU and Taxi are also good for dipping, though they are very strong.