  Here I summarize some of the salient features of technicolor theories with
technifermions in higher dimensional representations of the technicolor gauge
group. The expected phase diagram as function of number of flavors and colors
for the two index (anti)symmetric representation of the gauge group is
reviewed. After having constructed the simplest walking technicolor theory one
can show that it is not at odds with the precision measurements. The simplest
theory also requires, for consistency, a fourth family of heavy leptons. The
latter may result in an interesting signature at LHC. In the case of a fourth
family of leptons with ordinary lepton hypercharge the new heavy neutrino can
be a natural candidate of cold dark matter. New theories will also be proposed
in which the critical number of flavors needed to enter the conformal window is
higher than in the one with fermions in the two-index symmetric representation,
but lower than in the walking technicolor theories with fermions only in the
fundamental representation of the gauge group. Due to the near conformal/chiral
phase transition the composite Higgs is very light compared to the intrinsic
scale of the technicolor theory. For the two technicolor theory the composite
Higgs mass is predicted not to exceed 150 GeV
