Scott Rosenberg says that Salon is working with UserLand to get personalized URLs on Salon weblogs. If you're one of the people who isn't using Radio Userland because of the numeric URLs, you can either publish your weblog on the free Python Community Server or use FTP to publish it to any URL you like.
Or, if you feel like being completely different, you can use phpStorageSystem on the web server of your choice, and get locally-hosted comments as well as the URL of your choice.
Warning: it takes a bit of hackery to get it going. Drop me a line if you want to try it and it doesn't work out of the box.