Try the Lumocolor Correctable 305F-9: black, fine tip dry erase marker (Fine). Unlike regular dry erase markers, this special correctable marker is semi-permanent and does not smudge easily like conventional dry erase pens.
These are really cool. Not sure what else to add - it's a semi permanent, wet-erase marker.
I love the pen. Easy to write with and erase (even after a few days). The only drawback is that the top comes off easily, and the pen dries out fast!