In reply to how to get Omniremote to work for Phillips Tivo ,the trick is to set the carrier frequency to
37500.You do this by tapping the Omniremote button at the top of the screen,then the options button,then the preferences button.This will bring to the screen where you can choose the carrier frequency.
As a side note I have a pdb.file for Phillips Tivo with some interesting macros I would be willing to share with anyone that is interested.