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https://stripe.com/
Payment API built for developers to process credit cards. One can even process payments via curl!
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http://www.moneysavingexpert.com/travel/cheap-travel-money#debitbeware
Great article from MSE on the best cards (credit or debit) to spend and withdraw cash on overseas. Best for me is currently N&P.
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http://www.moneysavingexpert.com/banking/foreign-currency-exchange
Great advice from MSE on how to send money overseas. Includes a link to the post office international transfers, which offer better rates than banks, no fees, and arrives in a similar amount of time. Bloody brilliant.
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http://visionwiz.net/2010/01/you-can-use-paypal-account-anonymously/
Simple article on how to set up a PayPal account that is not easily or directly linked to a person's name.
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http://www.blackhatworld.com/blackhat-seo/making-money/142412-how-setup-anonymous-untraceable-paypal-account.html
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.
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http://www.interac.ca/
Interac offers an email money transfer service between people with Canadian bank accounts.
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http://www.getharvest.com/
Expense reporting, time tracking and invoicing system. Starts from $12/mth for 1 user. $40/mth for 2-5 users. Pricey, but looks solid. Includes twitter based SMS/IM integration (neat). Feels quite ajaxy, nice design. Hat tip Jamie Cockburn.
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http://www.myintervals.com/
Intervals is an online time tracking / invoicing system like FreshBooks / CashBoard. The web site seems dull. SSL is only available on $100/mth+ packages. $20/mth covers up to 10 projects, 500Mb, unlimited users.
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http://www.getcashboard.com/
Online time tracking and invoicing tool like FreshBooks. Paid accounts from $12/mth, 7 projects, unlimited invoices, unbranded, online payments, pdf invoices. Looks good. Multi-currency support.
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https://epoch.com/en/index.html
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.
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http://www.blinksale.com/home
Blinksale is an online invoicing service, similar to FreshBooks, but with less functionality. Free for 3 invoices / month, $12/mth for 50, $24 for 250 including PDF invoicing, $49 for 1'500 invoices. Oozes ajax / rails / design. Integrates with PayPal.
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http://www.verotel.com/
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%.