Bart: There are several options available.
The WS13A that Brian suggested is one good
one. An better option might be the SmartHome
ICON On Off Switch (p/n 2876SB). This switch
uses Insteon technology, which is both
forwards and backwards compatible with X10.
It also has a true rocker action (tap the top
to turn it on and the bottom to turn it off).
To top it off, it is cheaper than the WS13A.
If you want to control the light and fan
separately, you could use two in-line modules
(the X10Pro XPFM for the fan and either the
XPFM or the XPDF for the light). You could
then replace the switch with some type of
keypad (the SmartHome KeypadLincs are nice).
You probably wouldn’t be able to fit both
in-line modules in one box though, so this
option would probably only work if the light
and fan use separate boxes although you might
be able to replace the box with deep box to
get it to work. I am surprised no-one has
developed a light/fan in-line module which
will control both a light and a fan separately.
All of these modules are available from
Automated Outlet
(
http://www.automatedoutlet.com), who I find,
tend to have the best prices and provide good
service.