Been mentioned a thousand times before but it bears mentioning again. My personal foolproof technique for seating the wheel is to pull it back against the chain, put the box end of the wrench on and spin down so it's almost against the forkend, start pulling on the box of the wrench as you tighten down. Once it's just a little tight (fingertite[tm]), check your chain tension. If it's a little too tight, as it sometimes can be, a little tap with the wrench will move your axle forward in the ends. It should be good now, just the teensiest weensiest bit of play. Now wrench that F'er hard. My mtb's driveside locknut is actually mushroomed because I didn't wrench it tight enough the first time I went for a real ride and the wheel slide forward pretty seriously. I fixed that. Then you can tighten the NDS as usual. Only the driveside needs to be tight as a banker.