Has anyone ever seen the "WARNINGS" on the Google Webmaster tools? I keep getting it for things like Duplicate Title Tags.... Is this just a "warning".... or do you think its penalizing placement in the SERP's???
You need to use different and unique titles for every page on your website, however try to describe the page content
Just correct the problem google warned you. You don't have much weight if you have duplicate titles. Title is believed to be the most important element in search engine and seo.
I suggest you change all the duplicate titles to unique titles. Some times, one page is accessed via more than one URL, which result in duplicate content. So I suggest you do take a look at the errors in webmaster tools and remove the errors.