Some interesting forum postings:
[Controlling the Push LCD with sysex], created by Adam Murray, digs out his MIDI monitor in order to track down - and conquer - placing text on the Push LCD display.
[Florian Zand's Push Development Kit] goes even further, providing a self-developed system for accessing the Push system. His [blog page] - and especially his [development page] - about this project can provide some interesting insight on the way the Push interacts with software.
Information in this Wiki:
The Frequency Mixer: An example of using standard Max coding to take control of the Ableton Push and create a user interface for an interesting mixing tool.