I don't know of any websites per se, but Torr's type-up of the Moz letters to Robert Mackie feature limited scans of Mozzer's handwriting.
http://torr.typepad.com/weblog/2008/01/moz-penpal-lett.html
These letters to Robert Mackie formed the painstaking basis for creating the true type Mozfont.
Also, there's a mozzolo user named Mozmal (?) who actually got letters from Moz and scanned them. His avatar is a piccy of one of the letters.
http://www.morrissey-solo.com/article.pl?sid=06/08/24/1736248
Thank you so much for sharing these links! I was just about to go up to bed (it's 5:30AM ) when these caught my eye. So, sleep had to be sidelined.
I remember Mozmal's post on mainpage, he was also very lucky to be a penpal of Morrissey in 83.
http://www.morrissey-solo.com/article.pl?sid=06/08/24/1736248
I have a handwritten setlist Boz gave me on the 97 tour I could show you
brilliant, thanks for sharing!the scanned penpal letters: