Or you may want to consider a set up like this. This is what I'm using now in pdf format. There are all kinds of free pdf software out there that will do about everything the MPP will do.

I find it convenient to set mine on a good music stand like shown here with the lap top on it's side.
http://www.amazon.com/exec/obidos/ASIN/B0002WPSBC/ref=nosim/coffeeresearch64672-20