Other vBulletin messageboards I've used have added this feature. You receive an automated PM whenever someone quotes. Within the PM there's a link taking you back to the post containing the quote.
I'm not sure that we have that feature, but it would be nice.
To find my quoted posts:
Every once in a while, I search my user name and click the dial that says "Show Post" to see if I've been quoted and need to respond to someone. HTH!