If your blog hosting service does not provide statistics on who or how many people are visiting your blog, Sitemeter is one of the more popular tools that can be installed. There is a free and a priced premium version but many people find that the free version is more than adequate. Once you have signed up, there are instructions on how to install it on different blogging platforms. As well as page views and visits, it provides stats on browser use, operating system, location and entry pages.
JISC Involve was brought to my attention by one of the participants at the recent UKeiG Beyond Google workshop. To quote the web site: “JISC Involve is provided by JISC as a free service to the JISC community. Anyone with a .ac.uk email address can sign up instantly and be blogging in minutes.”
The service uses WordPress but blogs set up via this route have jiscinvolve.org instead of wordpress.com in the URL of the blog.