Comparison of services similar to PayPal?

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I guess PayPal is the best of it's kind, but what other ones are there? What do you like and dislike about them? Only other one I use is AlertPay, but I don't like it much as much as PayPal in the way that it cost fees to withdraw money, etc. I've also heard of e-gold, moneybookers.com, Google Checkout, etc. but never used them before. Let me know your opinions!