Footpedals are becomming more and more important because one can use them to switch articulations and add effects...

I use 2 sustain pedals an expression pedal and : http://line6.com/footcontrollers/fbvexpressmkii.html

PErsonally i prefer using my feet mote and more to add expression to my solo sound. that way i can keep my hands at the keys while adding lovely effects to my sound.