Visitor tracking software can tell you which posts your audience likes best, which ones don't get viewed and how the search engines are delivering traffic. Use these clues to react and improve your strategies. Feedburner is great for RSS and I'm a personal fan of Indextools. Consider adding action tracking to your blog, so you can see what sources of traffic are bringing the best quality visitors (in terms of time spent on the site, # of page views, etc). I particularly like having the "register" link tagged for analytics so I can see what percentage of visitors from each source is interested enough to want to leave a comment or create an account.
