Do you use Google Webmaster tools for your website? I find it pretty effective to see the amount of impressions/clicks we are getting in the search engines, to see what keywords are doing well for us and to monitor any crawler errors. Do you use Google webmaster tools for your website?
Yes, it is really great for finding information (important information that matter for search engines!) about your website. Google also recently released a few new tools, one of them being Data Highlighter.
Also, Google Analytics goes hand in hand with Google Webmaster Tools!