This month is a look at cases for the iPod touch. If you have an iPhone, however, there should be a bit of overlap since most of the companies have twins. In a perfect world I'd have reviewed cases for the iPhone, but hey, you can only review what you got -- and I have an iPod touch...
By the way, even if you're not in the market for a case, whether for an iPod, iPhone, or other Smartphone, the article is worth checking out for the discussion of protective screens. There's some interesting information, I think, as a result of a test I was able to do about scratching a phone's screen. It's near the bottom of the article and looks at products from Zagg and Wrapsol. (Both are bizarrely impressive, but I preferred the Zagg.)