Google has a new tool .. Google SiteMap Generator, what makes it different from other site map generators is that it also monitors your webserver traffic. Try it out
http://code.google.com/p/googlesitemapgenerator/
Here are some more tools that will help you analyze and optimize your site
UrlTrends: URL Trends is one of my favourite tool to analyze any site. Just enter the url and it will provide you with a trend report which includes link popularity, PageRank™, Alexa Rank, keywords that you can find the site by and more. And [...]