There are two interesting considerations concerning planets that are appropriate to discuss here. The first is that similar astrometric methods as described here for binary stars can also be used to detect the presence of unseen planets around stars. The second is the issue of whether in binary star systems there are planetary orbits that are (1) stable, and (2) conducive to the evolution of life.
Here is a set of links to the general question of extrasolar planets:
Here is a Java applet that lets you explore the orbits for some newly discovered planet candidates in other star systems.
Here is a Java applet that lets you explore the possibility of a stable planetary orbit in a binary star system, and the implications of that orbit for the amount of planetary heating by the two stars.