Smart Writers About Blogs contains a good definition of a "blog." Here is an excerpt:
A web log is a web application, which contains periodic time-stamped posts on a common webpage. They are also known simply as blogs. Blogs can be an individual diary or a way to advertise or track political campaigns, corporations or a large community of writers. You can usually leave public comments and also a link back to your blog. This is common practice and aids in the creation of an interconnected blogosphere.
These online blog community pages and posts can consist of article summaries and opinions to simple bullet lists of hyperlinks to what the blogger is reading, watching and listening to. According to a recent study by Technorati, the number of blogs is now close to 8 million. Most people see their blogs as a form of self-expression but they often find they are learning as much as they are teaching, about themselves. You can find blogs that cover such differing subjects as knitting (with pictures and commentary on the evolving piece) to the medical world where a patient chronicles their pre and post surgical story.
In addition to the blogging section there are a lot of resources on this writers site — on almost every writing topic! Here is a link to their sitemap.
