It appears that blogrolling.com has been hacked. Many blogs I visit which use their blogrolling service now have links which all point to one site. (No point in mentioning or linking to this site. It is down now anyways - probably overloaded by curious traffic.)

I'm sure the issue will be resolved in due time. It also looks like each account will have to delete all existing (misrouted) links and re-enter their blogroll. It is possible to completely avoid this kind of issue as well as descrease your site's loading time by managing your own blogroll. Here is how I do it: MT: Blogroll Management.