2009 is going to be the year of the online shopping cart. Internet Christmas trading was up, despite the economic downturn, continuing a year-on-year trend of shoppers flocking to online stores for convenience.

But not all online stores are built equal. A badly designed shopping cart or poor understanding of online customer wants and needs can lose you sales. As more businesses launch online this year, minor mistakes can become major headaches as consumer choice causes potential customers to flow to the competition.

So what are the biggest crimes against ecommerce an online store can make?