I suspect you’ve always wondered how google gets the snippet information that it displays with the link to your site in it’s SERPs. Well I have too, and now i’ll let you in on the secret http://googlewebmastercentral.blogspot.com/2007/09/improve -snippets-with-meta-description.html
“We want snippets to accurately represent the web result. We frequently prefer to display meta descriptions of pages (when available) because it gives users a clear idea of the URL’s content.”
So it seems that google does care about meta descriptions after all…
How do we apply this to dynamically generated products then I hear you ask. Well firstly I’m going to imagine that you have your product information stored in a database or flat file format and you know your SQL/parsing queries that will pull the relevant tags.