I recently changed my website url format from:
www.mywebsite.com/index.asp?view=display&postid=100
To
www.mywebsite.com/this-is-the-title-of-the-post
and noticed that click through rates to article increased about 300% after the change. It certainly helps the user decide if what they're thinking of clicking on is relevant, in terms of SEO purposes though I have to say I've seen little impact after the change
