Or you can enable Developer mode in Safari, enable extensions and use Tynt Blocker http://github.com/bdougherty/tynt-blocker

I personally use TinkerTool to enable Developer mode but there are other ways to do it as well.

Yep. TinkerTools is cool, am using it as well. But compare to Firefox, Safari still lag of developer support ;(

I'm not sure this has anything to do with Tynt: that's some JavaScript embedded in the page, while Safari itself seems to be adding the URL to the text. This web site, for example, doesn't use Tynt, but the URL still pastes (as previously mentioned, as long as you copy /all/ of the article into a rich text email).

To enable Dev mode you go to Safari>Preferences>Advanced>"Show Develop in the Menu Bar