Just finished talking with the people over at BabbleBug.com and they've got a neat new feature that lets you refill your phone directly, without having to punch in any PIN numbers into your phone or junk like that. Plus you can pick what refill amount you want, continuously, from $20 to $99, plus a $10 refill, though they do charge 50 cents if the order is less than $20. But I think it's pretty sweet that you can add exactly the amount of money you need to the acount, whether it's $10 or $45.67. And the PIN-less thing is really nice.

Oh, and you can't get this anywhere else yet...BabbleBug has it exclusively. Here's a direct link to the place where you can get the refill:

Prepaid Cell Phones,Prepaid Cell Phone Plans & Prepaid Wireless Cell Phone Airtime Refill Minutes Online at Babblebug.com.

Hope this helps!