Although you haven't been able to see the effects for a long time since they hid karma behind a vague description, you do realize that getting a submission posted is worth 3 karma points, right?
I don't see why links for the submitter's name shouldn't always be nofollow links. The submitter's home web site is not the subject of the article, so there's no reason Google should be able to associate it with the article. Hey, if he's got a worthwhile page on george-harrison.info that's worth linking to as the point of the article, I've got no problem with that. It's just the automatic link to the same site attached to his name that is the problem here.
Also, web site links in the headers of posted replies should be nofollow links as well. The whole point of this BeatlesBeatles controversy is a link to his web site which is not part of the topic. The same should apply not just to "george-harrison.info", but also to "(http://www.ourmedia.org/user/38299 [ourmedia.org])" (<--hey, check it out, a nofollow link, CmdrTaco is censoring me! Help help, I'm bein' opressed!) and other such links in the comment headers and signatures. Okay, so he's got his link on the front page, but the idea is the same. Links to a submitter's / comment poster's websites are off-topic, and should be rel=nofollow. If nofollow is good enough for comment text, it should be good enough for home page links, too.
The same should probably apply to links in signature lines as well.
So for some strange reason, we can't post links in comments without getting a nofollow slapped on it, but we can set our homepage and it won't get a nofollow, and every time we post a message, we're doing the same thing as BeatlesBeatles! Oh man, I feel so dirty. Oh wait, I don't have a home page set up. But look at the HTML source to any message you've posted and you'll see what I mean.