I really got into photography the summer before my senior year of high school, and purchased my first dSLR that July. I had been reading around on POTN since that spring, and was registered for a photography class at my high school. I honestly did not learn a thing from that class because I had already learned everything on my own from POTN, my own reading, and practice. Granted, it was only a high school class, and I'm certainly not a pro. But I lived down the hall from a photography major my freshman year of college (he was a junior at the time, well into his coursework), and still knew leaps and bounds more than he did about photography. I'm sure he was much more educated on the history of photography and art, and they are forced to take a class where they only shoot with film cameras (something I've only tinkered with), but when it came to actual photography and the ability to learn to use and capture light, he was still very much a newb. So from that standpoint I don't think a class is necessary- there are resources everywhere, and POTN is a pretty comprehensive resource in and of itself. And honestly the technical aspects of photography are the only thing that can really be taught, and are not hard to learn. Learning to properly expose a photo and to use the camera is something you can learn on your own. But learning to create good photographs isn't something that can really be taught in a classroom setting- you just have to practice and observe others' works and see what works and what doesn't.
The only time I might recommend taking a class would be if it's being taught be a seasoned pro and is on a specialized topic of interest to you- ie. weddings/glamour as mentioned above. But any sort of photography class or workshop from a university or anything that's on general photography is a waste of your time, in my opinion. Just hang out on POTN! (give your wallet to your wife before doing so though...)