Provided you post the URLs of self hosted blogs you want deleted from your account into a forum thread like this one, Staff can do this for you. Please do that now as this thread is tagged for their assistance. Please subscribe to it so you are notified when they respond.
I was hoping I wouldn’t have to publically list my websites here! This seems a very intrusive way to delete the linked blogs… Let’s hope WP develop a better way to make this happen, and staff.. you have access to my account so there’s no need to list them here in the public arena.