Technically, Mapster doesn't have the instance maps, the default client does as of the 3.0 expansion. That's why they're only for WotLK dungeons. But, if you like, there is AlphaMap:
http://wow.curse.com/downloads/wow-a...ns-update.aspx
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"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff,
The Tao of Pooh