In addition to self-syndication issues in my 12/9 posting, there will be contractual issues that arise when some blogs make the inevitable transformation from interesting project to paid content provider.
Here are some practical matters to anticipate:
1. Warranties: The buyer of blog content will insist that the content: a) will not infringe upon any other party's IP rights; b) will not contain defamatory material; c) will comply with all applicable US and foreign laws and regulations; and d) will be Y2K compliant :)
2) Indemnification: The buyer of blog content will insist that the blog indemnify the buyer for any losses arising out the breach of warranties.
These sticky issues will act as a deterrent for many bloggers who have no real ambitions to break into the world of paid content. Bloggers who do have an interest, however, should be prepared to deal with this kind of commercial red tape, as the "Attribution-NonCommercial-ShareAlike 1.0" version of the Creative Commons license is not designed for "Blog-as-Paid Content Provider" arrangements.
As David put it in an earlier comment: "Will bloggers decide to form LLCs to at least have the protection of limited liability? After all, other media outlets, such as newspapers and television stations, are corporations, why not bloggers?"