You don't need the date. It does let your users know how outdated a topic or post might be. I wouldn't use dates in your permalinks because it makes the URL's too long.

i agree with DPWeb. remove your dates. It also ensures better SEO. You know how to change it right?
Go to permalinks and enter this custom string. /%postname%/

Personally I have not found that dates on blog posts on all my wordpress sites etc have affected my ratings in Google and my often ranking of page 1 #1 and #2, Google likes history and depth to any site obviously if it improves your position it is worth a go.