Much like the Theme Store, you can use Shopify's App Store to buy add-ons for your shop. Add-ons offer diverse functionality, from enhanced analytics, through loyalty cards, Facebook integration, and "roll-your-own" daily deals. While some Apps are free, most are offered on a paid monthly subscription basis (unlike themes, which are a one-off payment).

Once you've added some products and set the general vibe for your store, you can configure payment options for your customers to use. Shopify supports both and Google Checkout, as well as numerous credit card gateways such as Moneybookers, Chronopay, and more. If you wish, you can even accept COD (Cash on Delivery), money orders, or bank deposits.

Setting up an online store still takes work and attention to detail, but Shopify certainly makes things smoother and handles much of the heavy lifting for you. If you don't mind the fees involved, Shopify is a solid option that could get you on the road to online sales that much faster.

Note: This link takes you to the vendor's site, where you must sign up to use this Web-based software.