There is an article in the Wall Street Journal Today that shows the venerability of small businesses to attacks on their POS systems to obtain credit card data.
http://online.wsj.com/article/SB1000142 ... 60768.html
This is not new news but just another example why your systems should be protected and you should become PCI compliant. RetailEdge is a PA-DSS validated point of sale software but again this is only a small part of the PCI Compliance process.