Gyroscopic Investing

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Just to play devil's advocate a bit here...

Having so many links in the chain means that if any one link goes bad, the chain itself can be reconstituted using another company to replace the bad link. Having Dwolla as a single point of failure means that you're relying on them for everything. Then again, I suppose you could simply have multiple payment processors alongside Dwolla to mitigate this risk.

I've used both PayPal and Google Checkout as payment processors for my business and I've been pretty happy with both. I really wish my shopping cart software let me accept Bitcoins though! 

Change your shopping cart software.  https://en.bitcoin.it/wiki/Category:Sho ... Interfaces

I definitely plan to accept Bitcoins whenever I get my e-commerce site off the ground.