  Transiting planets are generally close enough to their host stars that tides
may govern their orbital and thermal evolution of these planets. We present
calculations of the tidal evolution of recently discovered transiting planets
and discuss their implications. The tidal heating that accompanies this orbital
evolution can be so great that it controls the planet's physical properties and
may explain the large radii observed in several cases, including, for example,
TrES-4. Also because a planet's transit probability depends on its orbit, it
evolves due to tides. Current values depend sensitively on the physical
properties of the star and planet, as well as on the system's age. As a result,
tidal effects may introduce observational biases in transit surveys, which may
already be evident in current observations. Transiting planets tend to be
younger than non-transiting planets, an indication that tidal evolution may
have destroyed many close-in planets. Also the distribution of the masses of
transiting planets may constrain the orbital inclinations of non-transiting
planets.
