PayPal is the king of online payment for eBay auctions. What many people don't realize is how easy credit card processing is with a free PayPal business account. Because PayPal is so widely known, they are a highly trusted payment service on the internet. Plus, you can also process eChecks from a customer's checking account.

They also offer shopping carts, invoicing by email, virtual credit card and many other merchant tools. PayPal lifts many barriers faced by small, upstart businesses. Best of all, it's completely free to sign up! They simply charge a small fee for each transaction processed, comparable to many other services but without a monthly service charge. Once you're signed up, you can also participate in their referral program to make a little extra dough.

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