White Box based but skill based rather than class based and d6-only.
What I really like is that I mentioned to the designer (via RPGNOW) that like all the other WB based games, wilderness adventures and travel is ignored. He responded by immediately adding 5 pages of extra content focusing on just that.
At first glance the integration of skills and six-siders into the system is very nicely done. $3 (ish) for the PDF and quite spendy for the hard cover at Lulu but I believe there's a paperback on the horizon.
Worth a look methinks.http://www.rpgnow.com/product/182010/Dungeon-Questing?term=dungeon+questing