To each his own, however, I do not use the cron.daily version, but use a crontab entry:
# run yum check for updates daily and mail results to root
0 5 * * * root /usr/bin/yum check-update 2>&1 | mail -s "yum check-update output" root
The biggest problem I had with doing what you did is that it emails you every day with the output from yum regardless of whether or not there is an update.
My script ends up only emailing me when it found an update to apply.
-Dave
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