The South boards on Chowhound have a running commentary about Charlotte's eateries, restaurant reviewers (thanks for the kind words) and other gossip: www.chowhound.com/south/boards.
An organization that requires membership in order to post (though anyone can read the posts) is The eGullet Society for Culinary Arts and Letters: forums.egullet.org. A search for "Charlotte" yields hundreds of postings.
Although not technically a blog site, nerddinner.com/blogs/charlotte/ is an assessment of the restaurants where this group holds their monthly meetings. As one blogger writes: "Mixing food and Geeks creates a dangerous combination."