Nice - I should do this to my own site. Some years ago I pitched the idea of a daily outbound link site wide checker to inform the user if the endpoint had changed in any way. Wish I had the chops to build it myself back then. Came about because a Honk Kong Bank, I worked for the parent company, had a link to a domain that had expired and was taken over by a porn site and the first people to notice were some Hong Kong Journos - massive embarrassing story in HK. No one was interested though.