Yesterday I noticed that the Wordpress site of a well known Musician had been hacked (the header is stuffed with #*$! links). I only noticed this because I was checking to see if it was a Wordpress site and had a look at the source (the links aren't visible on the page).
Anyway, when I looked for a contact form, there wasn't one and there is no means whatsoever to contact the webmaster. Eventually I sent an email to the address listed in the domain registration - but today the site is still in the same state as before.
It's not the first time I've wanted to contact a webmaster to offer help (normally it's a bug rather than a hack), only to find that there is no means of contact.