While I planed to install Skype on my 64bit Fedora machine I had to install a lot of i686 packages which I want to delete after I came to the conclusion Skype is not worth to be installed if they are not able to build a 64bit package.
To remove the last 49 packages I used this command:
yum remove `
-d \ -f 5`
Thanks to: http://raftaman.net/?p=987