Ever since I scored the Garrard 301 I have become a vinyl junkie. Doing some reading at the vinyl engine I found this link to microoscopy of vinyl recordings. I find this fascinating. All that beautiful music comes from these grooves.
The site also has some great detailed pics of stylus.
This is a great five page article.
http://www.micrographia.com/projec/projapps/viny/viny0000.htm