Are there power H bridges that come in a package of some kind?
If so, what external connections are there?  I imagine this as the
solid-state version of a DPDT switch.  My question basically is what
do these things look like?  If somebody has gone to the trouble of
matching four FET's (probably 2 N channel and 2 P channel) in a can,
this should simplify building any circuit that needs something like
this.  I am thinking of stepper motor controllers as well as the DC
motors described in earlier messages.  One might even be able to build
inverters or synchronous rectifiers using them as long as the load's
ground path doesn't connect the input and output of the bridges.

Martin McCormick