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That would be nice, wouldn't it? Unfortunately, there is no API with the search engines where we send over a keyword and they send us back why the rankings for that keyword changed. Right now, it's manual work. Look at you and your competitors and see have inbound links changed? Have you or your competitors changed content on the pages that were ranking? Added new pages? Consolidated pages? Has there been an algorithm update? and so on.

+1 I use Yoast's plugin on my personal sites

Hi Pete, Sorry I was referring to the titles themselves. If Google doesn't think that the title is a good match for the query (maybe it contains different keywords or is too spammy), it will select another snippet of text to show in place of the title in the SERPs. This obviously isn't ideal as it takes the control out of your (and you client's) hands.

Im another for blog on domain and ending /blog not blog.domain.

Thanks for the advice and guide

You can do an on-demand crawl test of up to 3000 URLs at http://pro.seomoz.org/tools/crawl-test, which might help.

You can also add meta descriptions to the tags individually in WP.  Just go to "Posts" >  "Tags" and then edit each tag to have a meta description. On a side note, in a wordpress site, it is really not a good idea to index your "Tag Pages".  Sure 3 years ago you would have wanted to because Search Engines put more value on how many pages your website has.  In 2013 it has a number of negative consequences that Google especially doesn't approve of.  First it adds a ton of pages to your site too quickly - Google likes things to grow at a common rate.  (If you have a team of 30 people blogging 5 blogs a day Google will see that and be ok with more tags, but if your adding one blog a day and 25 pages are being created thats a problem)  Second, if you add one blog and give it 5 new tags that have never been used before, Google will see 5 new pages with the exact same content on it.  You will see these errors on you SEOmoz Campaign report.  Lastly, its hard to control the meta descriptors though easier with a SEO program. Leaving out your Tags but indexing your Categories may be a better option, but of course that draws the question, why use tags at all right?  Well in the search engine world, its best to create for the user and not the search engine.  So tags are used to help the user find other articles or blogs like the one they have landed on.  In the last 5 years, tags were about creating huge amounts of pages but now days you have to weigh the good over the bad. -this is my opinion and not that of SEOmoz.-

Hi Justin I have now resolved the duplicate page title as mentioned. However I am still getting lots of "duplicate page content" errors on all my wordpress tags pages. Any idea's why and how to resolve this? Thanks Pete

In the sense that a report is alerting that there are too many links on a page though is going to be because it is warning of authority leakage more than anything else though. Granted, the insertion of 'just' in my previous statement probably misleads... I agree though that if you were to link every page to every page, it would just cause a royal headache to crawlers - why one would do that though is beyond me.