Can you delete your account? Yes and no. Not for individual Blogger/Blogspot accounts, because these sites belong to Google. See http://www.google.com/support/blogger/bin/answer.py?hl=en&answer=41932 where you can read how to (at least) erase your blog entries. However, you can terminate your account by deleting your Google account. See the Google entry on this site. Not a very neat solution.
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.