(Apologize in advance to the linking to my site, but I have been nailing down these issues the last week or so and it is easy to show how things work with a functional site)
Ok, so I picked up a few that I could see right off the bat ...
1) Duplicate Content Penalty Concerns Caused by a Canonical Domain Problem -
Your site has the potential to get hit by the duplicate content issue due to the fact that your www version and non-www are actually two separate links. In general, you want http://yoursite.com and http://www.yoursite.com to lead to 1 URL only, not two. This is generally an easy fix by adding 2-3 lines in your .htaccess file (they may already be there, just commented out). I wrote a short write up about the issue here - http://www.hagrin.com/241/seo_guide_canonical_domains_apache_http_301_re... . You could also check out my .htaccess file here - http://www.hagrin.com/.htaccess (it's near the bottom).
3) No META descriptions on your pages -
While some will say that META anything is "so 1990s", if your pages are not differentiated by unique META description tags, Google used to throw your content into the supplemental index and you wouldn't see them in normal searches. You can verify this by checking out Google Webmaster Central again by going to Diagnostics - > Content Analysis and you will see Google will flag those indexed pages where you have "short" or "duplicate" META descriptions. You can rectify this problem by setting META descriptions through the Meta Tags module (which it looks like you have installed).
Otherwise, looks pretty good. You have keyword friendly URLs, the Sitemap module going and good unique content which should help greatly.
Comments
Use www or no www and stick
Use www or no www and stick with it - configure it in htaccess
Original, keyword rich content is the main thing in SEO, technical things count for a lot but content is always king my friend.
You have a lot of issue there, contact me personally if you would like more help.
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A Few ...
(Apologize in advance to the linking to my site, but I have been nailing down these issues the last week or so and it is easy to show how things work with a functional site)
Ok, so I picked up a few that I could see right off the bat ...
1) Duplicate Content Penalty Concerns Caused by a Canonical Domain Problem -
Your site has the potential to get hit by the duplicate content issue due to the fact that your www version and non-www are actually two separate links. In general, you want http://yoursite.com and http://www.yoursite.com to lead to 1 URL only, not two. This is generally an easy fix by adding 2-3 lines in your .htaccess file (they may already be there, just commented out). I wrote a short write up about the issue here - http://www.hagrin.com/241/seo_guide_canonical_domains_apache_http_301_re... . You could also check out my .htaccess file here - http://www.hagrin.com/.htaccess (it's near the bottom).
2) Home Page Duplicate Content Problem -
In general, you want the following 4 URLs all to go the same URL -
http://yoursite.com
http://yoursite.com/index.php
http://www.yoursite.com
http://www.yoursite.com/index.php
Google treats the above 4 URLs as all being different. This is verified by what I recently saw in my Google Webmaster Center - my highest ranked page was flip flopping from a http://www.hagrin.com and http://www.hagrin.com/index.php. To resolve this, you will again make a small modification to your .htaccess file and you can read how to do that here - http://www.hagrin.com/321/preventing_duplicate_content_your_home_page .
3) No META descriptions on your pages -
While some will say that META anything is "so 1990s", if your pages are not differentiated by unique META description tags, Google used to throw your content into the supplemental index and you wouldn't see them in normal searches. You can verify this by checking out Google Webmaster Central again by going to Diagnostics - > Content Analysis and you will see Google will flag those indexed pages where you have "short" or "duplicate" META descriptions. You can rectify this problem by setting META descriptions through the Meta Tags module (which it looks like you have installed).
Otherwise, looks pretty good. You have keyword friendly URLs, the Sitemap module going and good unique content which should help greatly.
Good luck!