SCan it get any dumber? Jerry Yang's post on Yahoo's corporate blog, "Stepping down," is throwing me an error message that suggests Yahoo has banned the IP address of my Sprint wireless Internet card, but only for their corporate blog. And yet the post is visible on the blog's homepage. It seems too bad to be true: Yang can't even say goodbye right. Update: The "999" error indicates that the server automatically throttled itself to prevent a surge in traffic from taking the site down. Yang's resignation blog post had made the front page of Digg, the news-discussion site. What does it say about Yahoo's competence at building reliable websites if Digg can take down the boss's blog?