One more thing to add:
If you use the Google Sitemaps feature and Verify your site (once you've set up your Sitemap, there will be a tab for Sitemap, Stats, Error, Verify) you will have access to 3 additional, very helpful stats:
1) Query Stats. Shows the top queries used to find your site and top query clicks - the searches that resulted in the most click-throughs to your site. The first also shows you your Average Top Position for each keyword/phrase.
2) Page Anlaysis. Shows the most common words found in your content as well as in external link text pointing to your site. This will give you a very good idea of why are you ranking well (or poorly) for particular terms. Although there are sites with these type of tools out there, this is from Google itself, so it is obviously the most relevant!
3) Crawl Stats. Shows PageRank distribution within your site. A Low Distribution suggests your top page(s) - usually your home page - has most of the PR and you have not effectively spread it out to your sub-pages. It also, in the first column, shows errors, timeouts and other potential issues.
Seriously, people, if you care even a little about SEO then I highly suggest investing a little bit of time in getting a SiteMap up and running. There are so many advantages and almost certainly will give you far greater insight into why your site is ranking the way it is.
See (some of) you in Phoenix!
