I just had a look at the code and think it's more complicated than you need. It consists of the following modules
A library called ioMessage that provides an abstraction layer allowing tagged message packets to be sent and received.
A collection of stubs to be included in the sender sketch, the ones for the lcd match the fluery library and are as follows:
void lcd_init();
void lcd_putc(const byte c);
void lcd_puts(const char * string);
void lcd_clrscr();
void lcd_gotoxy(byte column, byte row);
The receive sketch uses case statements to decode the received messages and calls the appropriate LCD functions in the fluery library.
The stuff is not richly documented and my sketches pass much more information to the slave arduino than just lcd messages so it's a little complicated than you need. But if it sounds useful I will try to create a version without the non LCD code over the weekend and send it to you.
Oh, I almost forgot. The code uses a patch to the wire library that will be added to the next arduino release but you will need to make the change to wire.cpp on your machine if running version 0011 or earlier.
If you PM me your email address I can send you the code as is if your feeling adventurous