I bought the "Essential Accessories Kit" for the camera, offered through Amazon by ButterflyPhoto. There's probably a link to it from the camera's page on Amazon. For $39, you get a case that will hold the camera and small accessories, plus a tripod, mini tripod, card reader, and other useful accessories. Considering what cases cost alone, this is a really good deal, and it seems to be good quality stuff.
I really like my Tamrac Velocity bags. But they're a little big and pricy for just this camera, but it's a comfortable sling bag that's great if you have extra things to carry around. If you just want a little bit of protection with lots of mobility then consider a hanging sleeve style case like: Case Logic CHC-101 Compact System Camera Day Holster (Black)