We are in 2011, search engines are now using hundreds or thousands of parameters to weight a page. The URL is only one of them, is it still so much of an impact in the search results? People are sharing URLs through URL shortener: short, long, ugly or nice URLs end up in the same way! People also share email by clicking on 'I like this', they don't copy paste URLs anymore, and when I do it and see people doing it, they never comment if an URL is long or short or anything...
Is there still a need of having nice URL both for the users and search engines? If my rank on the search engine will change by 0.5% I don't really care... If I will make 2% of my user happy by having nice URLs I don't really care either...