Im getting very annoyed at a re-definition that is becoming popular. Many people on the internet are now using the noun blog to refer not only to a web log but also to the individual posts within a web log. This is just like referring to the articles within a magazine as magazines, its ridiculous.
From what Ive found the trend started with MySpace, rather than have a button that said post article, entry, or page they made their new entry button say post blog.
Everyone please stop trying to confuse the situation, use the word blog as it is defined. Refer to the individual entries in a blog as either, posts, entries, articles, stories, pages or one of the many existing synonyms.