When I create a post I am very methodical about making sure everything is just right before I publish it. One of the things I do is give my post shorter urls since the default auto-generated url is a copy of the title.
WHEN I SPECIFY A URL AND HIT PUBLISH THE URL IS CHANGED BACK TO THE POST TITLE!
PLEASE knock this behavior off, wordpress, if I specify a post url there is NO good reason to be replacing that url with the title of the post when I hit publish. None. Period. It's extremely annoying. In fact it makes me have to perform a url change on an already published post and this is messing up my RSS feed and, occasionally, Google has already grabbed the first default url. VERY ANNOYING.