Have you ever noticed that a search for tips about WoW brings up about a million blogs on the subject? Blogs can be found on nearly every aspect of WoW -- you can find lore blogs, class blogs, race blogs, profession blogs ... You name it, there's a blog on it.
I personally maintained a blog for raiding mages for a while, but I had to let it go when my raiding group went on hiatus and I simply couldn't fit any of the other raiding groups into my schedule. I'd like to get back to it. It was a lot of fun, and I also noticed that since I was trying to pay really close attention to mechanics so that I could pass the information on to other mages, it made me a better raider. My husband currently writes a blog about being a dad who games. I know that there are a bunch of those out there too, but it's fun for him to discuss situations that come up in his daily life with other people who understand completely.
What about you? Do you blog about WoW or gaming in general? What's your specific topic of expertise? Do you feel like you have a lot to contribute on the subject? Have you thought about starting a blog but just haven't found your niche yet? Do have any specific blogs about WoW that you really like?