This contains background links and info used to develop the Pi-LCD demo software
Quite a lot of the info has been written for the Arduino but it is relatively easy to convert for use on Python.
Existing LCD Python Modules
A Raspberry Pi LCD library for the widely used Hitachi HD44780 controller, written in Python
https://github.com/dbrgn/RPLCD
Tool for designing your own user character
http://mikeyancey.com/hamcalc/lcd_characters.php
simple explanation of how to upload user characters to LCD displays
http://solar-blogg.blogspot.co.uk/2009/02/displaying-custom-5×8-characters-on.html
Big digit stuff
Links to a nicely rounded set of 3 x 2 characters, great for clocks etc
http://hardwareswiki.com/raid_software_download/Large_numeric_characters_on_16x2_LCD_wit/948688/
The Meandering Pi and Friends 