EE gives clients great control over the url_title of the entry. This is great for publishing new entries, and necessary for editing entries in case of mistakes or any other "good" reason to change the url_title.
Being an SEO conscience developer who runs an EE site, when I change a url_title for an entry that has been published and indexed by Google, I set up a 301 Redirect using .htaccess, so previous users and search engines know where the new page lives.
Clients will not do this, of course. Without me telling them, they will simply change the url_title as they see fit. I believe this is something they should be able to do without contacting someone who knows about 301 Redirects. This is something that is handled automatically by WordPress (based on a limited understanding and experience with WordPress).
Are there any plugins or techniques out there that will accomplish this task you are aware of?