Never mind cloaking. (Where does cloaking come in, anyway? As the rule is written, you're showing the named search engines the same content you'd show to a human visitor.) Have you any idea how many redundancies and unneccessary lines are in that code?

RewriteCond %{HTTP_REFERER} !^http://www.example.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.example.com$ [NC]

Line 1: "A followed by / and optionally more stuff"
Line 2: "A followed by nothing-- not even the / element which will always be present"

NC = case doesn't matter, so if you forge my domain name as referer you don't need to get it exactly right.

RewriteCond %{HTTP_USER_AGENT} !Googlebot [NC]
RewriteCond %{HTTP_USER_AGENT} !Googlebot-Image [NC]
RewriteCond %{HTTP_USER_AGENT} !Mediapartners-Google [NC]
RewriteCond ${HTTP_USER_AGENT} !Mediapartners [NC]
RewriteCond %{HTTP_USER_AGENT} !Googlebot-Mobile [NC]
RewriteCond %{HTTP_USER_AGENT} !Googlebot-Video [NC]
RewriteCond ${HTTP_USER_AGENT} !Googlebot-News [NC]

=

RewriteCond %{HTTP_USER_AGENT} !(Googlebot|Mediapartners)

RewriteCond ${HTTP_USER_AGENT} !slurp [NC]

Really? Not someone I'd make an exception for, but to each his own.

RewriteRule .*\.(jpg|jpeg|gif|png|bmp)$ http://www.MYDOMAIN.com/ [R,NC] 

:: wanders off* sobbing brokenly ::


* Postcount suggests this is a perfectly safe action.