Mail.app is a really good and efficient email client for the Mac. But it has some lacks and annoying nuts. One of those is the fact that since Mac OS X 10.6, when you copy an email address, you also copy the name at the same time. I don't like this behavior as it's useless to me.
I found a trick on the New Mac User blog in order to change that. Close Mail.app and type this in a terminal window :
defaults write com.apple.mail AddressesIncludeNameOnPasteboard -bool NO
Now try to copy an email address from Mail.app and you'll only get the address. Yeah!
You can revert it back by typing this command :
defaults delete com.apple.mail AddressesIncludeNameOnPasteboard