The Safari 5 extension love continues as someone has released a Tynt blocker.
Tynt is that annoying javascript that appends “Read More: URL” nonsense to text you copy from some websites.
[Get the extension](http://github.com/bdougherty/tynt-blocker) (via the Download Here link at the bottom of the page)
Update:
Or you can get the more flexible [Javascript Blocker](http://homepage.mac.com/drewthaler/jsblacklist/) that comes preconfigured to block tynt.