Heres some more digestive material.
http://drumkit.toontrack.com/
http://www.sonicimplants.com/Products/drumimplants.htm
http://www.borg.com/~jglatt/tutr/miditutr.htm
If you only have the one Keyboard, a Midi Joystick interface should Suffice for now. Its also the cheapest route. Thats PC...