  Warm inflationary dynamics is shown to satisfy both the slow-roll and density
perturbation constraints for $m_{\phi} \gg H$ or equivalently $\eta \gg 1$ and
for inflaton field amplitudes much below the Planck scale, $<\phi > < m_{pl}$.
I start by reviewing the two types of inflation dynamics, isentropic or cold
inflation and nonisentropic or warm inflation. In the former, inflation occurs
without radiation production, whereas in the latter both radiation production
and inflation occur concurrently. I then discuss recent, detailed, quantum
field theory calculations showing that many generic inflation models, including
hybrid inflation, which were believed only to have cold inflation regimes, in
fact have regimes of both warm and cold inflation. These results dispel many
foregone assumptions generally made up to now about inflation models and bring
to the fore various elementary issues that must be addressed to do reliable
calculations from inflation models. I also discuss density perturbations and
observational consequences of warm inflation, especially related to WMAP.
Finally I show that warm inflation has intrinsic features that make the ``eta
problem'' nonexistent, and field amplitudes are below the Planck scale.
