X-ray "fix" is beak !

X-ray is normally fixed for minecraft 1.7.2, but there is a solution for bypass "the fixed x-ray glitch", You can watch how here:
http://www.youtube.com/watch?v=mxjWKgnj7mk
or an other possibility here:
http://www.youtube.com/watch?v=-G2IqEfAqR8