Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: PackageKit
    Memory : 153 M RSS (266 MB VSZ)
    Started: Thu Jul 12 00:03:05 2012 - 06:17 ago
    State  : Sleeping, pid: 4018
Another app is currently holding the yum lock; waiting for it to exit...
  The other application is: PackageKit
    Memory : 153 M RSS (266 MB VSZ)
    Started: Thu Jul 12 00:03:05 2012 - 06:19 ago
    State  : Sleeping, pid: 4018

Solution:

rm -rf /var/run/yum.pid 

To forcibly unlock, and then your Yum is ready to run

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