i have a key pad that needs 13 pins and a display that needs 7 pins can these be hooked together to work on the milnova?
if so how may i ask?
The analog pins, 0 through 5, can be used as digital pins 14 through 19. That's a total of 20 pins. Exactly what you need. Although you'll need to disconnect one of them in order to be able to program the Arduino.
is it possible to multiplex them as i have 2 pins needed for a stepper motor control and also 2 pins for an encoder?
You could replace the LCD with a serial LCD. Only needs one pin for data.
http://www.sparkfun.com/commerce/advanced_search_result.php?keywords=Serial+LCD&x=0&y=0&search_section=products
I think by "multiplexing" you mean the use of external hardware components? A solution depends on the wiring complexity you can accept and the money you want to pay for it.
I generally recommend an I2C port expander PCF 8574 or PCF 7574 or MCP23016, but with little feedback in this forum 
but with little feedback in this forum
Not sure what feedback you want but several of my projects have used a MCP23016. Like:-
http://www.thebox.myzen.co.uk/Hardware/Pendulum.html
This is an I2C interface chip, if you want faster then I have used a MCP23S17 which is an SPI port expander and woks much faster.