How many of your pages are listed on Google? Not sure? Then try this:
domain_name+site:www.domain_name.com [.co.uk, whatever]
It can make sobering reading finding out how many, or few, of your web pages have been indexed by the biggest search engine. Recently, whilst checking the site of a new client, I found that only 1 of the many pages had been listed on Google. The web developer had decided to turn the main navigation bar into an image map and Google had been unable to navigate (and index) any further pages. If you're unsure of whether Google has indexed a particular page, simply go to Google and type in the URL for the page you wish to know about. If it is indexed, Google will display its page title and a link to the site.
For any pages that are not listed, you have to help Google find its way to them. In the case of the client above the recommendation was to come up with a plain text navigation bar; have hyperlinks at the bottom of the page and ensure that internal keyword links can be found throughout the site.
Remember, sometimes Google may have cached (indexed) and old page of your website and, again, you will need to help Google re-spider this page. You can view the page Google has cached for your site by typing in its URL into Google and clicking the cached button. Here, you can see that Google spidered the page on the 7th September.