Cool new feature in Webmaster Tools - you can go into Diagnositcs and Content Analysis, and it will now tell you if you have issues with duplicate titles or meta descriptions, or non-indexable content.

From the Blog:

The Content analysis summary page within the Diagnostics section of Webmaster Tools features three main categories. Click on a particular issue type for more details:

* Title tag issues
* Meta description issues
* Non-indexable content issues

Selecting "Duplicate title tags" displays a list of repeated page titles along with a count of how many pages contain that title. We currently present up to thirty duplicated page titles on the details page. If the duplicate title issues shown are corrected, we'll update the list to reflect any other pages that share duplicate titles the next time your website is crawled.

Also, in the Title tag issues category, we show "Long title tags" and "Short title tags." For these issue types we will identify title tags that are way too short (for example "IT" isn't generally a good title tag) or way too long (title tag was never intended to mean <insert epic novel here>). A similar algorithm identifies potentially problematic meta description tags. While these pointers won't directly help you rank better (i.e. pages with <title> length x aren't moved to the top of the search results), they may help your site display better titles and snippets in search results, and this can increase visitor traffic.

In the "Non-indexable content issues," we give you a heads-up of areas that aren't as friendly to our more text-based crawler. And be sure to check out our posts on Flash and images to learn how to make these items more search-engine friendly.

http://googlewebmastercentral.blogspot.com...nd-sitemap.html