We don't really have a suitable forum for this. The Web Design forum is the closest but it's not the right place either - so I'm sticking it in here.
There are a number of articles about seo copywriting, such as the world's
http://www.internet-marketing-resear...opywriting.php But those articles aren't about copywriting, they are about search engine optimization copywriting, which is different.
Anyway, I just found
this site, which is about normal web copywriting, and is a must for every website developer - in my opinion. Even though the guy only lives about 10 miles from me, I'd never heard of him until I found that site.