You might have already thought of this, but have you thought about a plugin.
I was sure that the WPMU Dev guys did one that did a like (that wasn’t FB related) but I can’t find it (if you want to look it must be somewhere here but I’ve gone through it all and I can’t find it now http://premium.wpmudev.org/wordpress-plugins/)
I also found these plugins which might help:
http://wordpress.org/extend/plugins/i-like-this/
http://wordpress.org/extend/plugins/buddypress-like/
(Unfortunately I’ve not had time to test them first, which I usually like to do before recommending stuff, but maybe they’ll help you in any case)
Cheers
Nick
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