Latest the latest business card design I've been working on. I find two-sided cards stand out more because there's more room to brand your business when you have more real estate to work with. Of course it can be a drawback if a recipient is a dedicated rollodex user, but I generally don't let that deter me. You want to make a strong first impression with your card.
I'm also a fan of die cut shapes and embossing. These processes do add to the bottom line, but I find it's usually well worth the cost.