Using bold, strong, or emphasis tags within the body copy of your blog posts will help identify to search engines like Yahoo! which words/phrases should be given more weight. This is a useful technique for blog optimization. Notice that I made the phrase “blog optimization” bold in the previous sentence. That’s an example of this tactic in practice. 😉
Feel free to emphasize multiple phrases in your copy. Even make use of Heading tags if your post is particularly long. Just don’t overdue it. If it seems overoptimized when you read it, then it is!