One advantage I hear cited frequently is "RESTful" URLs are "a good thing". Personally, I have no idea. I haven't been pushed into REST.
Another advantage is search engine optimization. Generally search engines (their indexers really) won't crawl dynamic content. For example, don't expect http://foo.com/blog/viewEntry?date=1/1/2005 to get indexed. If indexing is important, you'd have much better chances with something like this http://foo.com/blog/2005/1/1/ If you're interested Google explains all somewhere in here: http://www.google.com/webmasters
