I've come to use the following command so often that I've written a script for it in my ~/bin - 'narrow':

    #!/bin/bash
    xargs -n 1 grep -l "$@"

This takes a list of files on stdin, then greps for the argument in all the files and spits out the matching files.

The perk is that it can be chained:

    find *.txt | narrow dog | narrow cat | narrow rabbit

This will find all the files that contain dog, cat, and rabbit.