My blog is in an LLC, but just a note that forming an LLC and "incorporating" (as in forming a corporation) are not the same thing. An LLC is considered a disregarded entity by the federal government, and the taxes are passed through to the members. A corporation is a separate legal entity.
You'll read a lot of places about LLCs being good because they protect
your personal assets, etc. From what I have read though, if you are a blogger and your
business is blogging in a way that you are essentially the business, it
is likely going to be very easy to "pierce the veil" of the LLC and go
ahead and say you are personally liable. For liability reasons, insurance is often a good idea. And definitely keep business and personal finances separate, as Everything Finance mentioned.