[message type="success"]Update Jan 2011: Yes. See Is BigCommerce PCI Compliant[/message]
There isn’t much to say about BigCommerce PCI Compliance – it will be before the new deadline, but it was supposed to be by the last deadline and it wasn’t.
My thinking is that they can not afford not to get this done so there should be no risk or worry about singing up with them. Need more information read this full list of pci compliant shopping carts
BigCommerce announced towards the end of January 2011 that it had passed all the tests and was only waiting on the final official report. You can get more details here as well as a link to several comments and guesses as to the exact date the report would be delivered.