My usual set-up is 1-3 for armies, 4-7 for queens and 8-0 for hatcheries.
number 1 I commonly preserve for the scouting drone and once it has done its job, I switch the hotkey for harassing units such as speedling, mutas or infestors.
Bear in mind that the numbers 8 to 0 are ALL key'd for same hatcheries, ALL of the hatcheries. There's no sense to select them one-by-one to produce units from them.