Simple article on how to set up a PayPal account that is not easily or directly linked to a person's name.
Vaguely illegal sounding article on how to use PayPal anonymously. Involves gift card based activation, a clean IP, and an anonymous card that can be used as a bank account. US specific.
Epoch are an online payment processor. Rates from 15%, paid bi-weekly, 2 weeks in arrears. US / EU offering. Looks fairly legitimate. Alternative to PayPal, etc.
Verotel is an online payment processor. They will process credit cards for you. Setup and monthly fees apply. Pro account is $1'000 USD setup, transaction fees are around 15%.