  Particle physics models with more than one Higgs boson occur in many
frameworks for physics beyond the standard model, including supersymmetry,
technicolor, composite Higgs, and "little Higgs" models. If the Higgs sector
contains couplings stronger than electroweak gauge couplings, there will be
heavy Higgs particles that decay to lighter Higgs particles plus heavy
particles such as $W$, $Z$, and $t$. This motivates searches for final states
involving multiple $W$, $Z$, $t$, and $\bar{b}b$ pairs. A two Higgs doublet
model with custodial symmetry is a useful simplified model to describe many of
these signals. The model can be parameterized by the physical Higgs masses and
the mixing angles $\al$ and $\be$, so discovery or exclusion in this parameter
space has a straightforward physical interpretation. We illustrate this with a
detailed analysis of the process $gg \to A$ followed by $A \to h Z$ and $h \to
WW$. For $m_{A} \simeq 330\GeV$, $m_{h} \simeq 200\GeV$ we can get a $4.5\si$
signal with 1 fb${}^{-1}$ of integrated luminosity at the Large Hadron
Collider.
