ShipStation

*UPDATE JAN 2016 #2*
A rep from shipstation called our business to discuss features they are working on. Sounds promising.
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*UPDATE JAN 2016*
In 2012, Shipstation was cutting edge. I think they stopped working on major features in 2014. Now looking at alternatives.

If you run a small business and need a pure shipping solution, shipstation is still a winner. If you need expanded functionality (barcodes, inventory management, etc), look elsewhere

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AUG2012 review: Good product. Much better features than the other option on shopify. Def still some bugs though, especially in the automation rules... however, support has been responsive.