I used titian panel a long time back, which displays your map coords.
But it is broken since 2.0 and never worked again.
zoloFighter displays your position, but that is a global position, not suitable when you go to thottbot for quest guides.
If you just want some light weight component, qLoc is for you!
Author: quel
Download:
WoWInterface Downloads : qLoc - coordinate display
Install:
Unzip it and put in your interface/addons directory.
On your initial screen, clcik the addons button, and select "Use outdated addons"
Next time you logon, you will see your map coords on your screen.
The file contains no binaries, just some xml/lua file, all text opensource and no virus.
Also bliz can not ban you on this.
DTK