GWT flagged some of the meta descriptions as "too short" (in the "Content Analysis" section)
I'm not so sure that this is the finality of it. Google may be using click data in it's algo to measure the relevancy of the title and description in accordance with a "satisfied" user experience :
WMT : About the Content Analysis page
The Content analysis page shows you potential issues Google found when crawling and indexing your site. We recommend that you review this report regularly to identify changes that potentially increase your rankings in Google search results pages while providing a better experience for your readers.
These issues don't prevent your site from being crawled or indexed, but paying attention to them can improve the user experience and even help drive traffic to your site. For example, title and meta description text can appear in search results pages, and useful, descriptive text is more likely to be clicked on by users.
It may assist in ranking Y/N? What's the verdict ?
[edited by: Whitey at 5:53 am (utc) on July 8, 2008]