Calling up HWWB in Blood Rites could possibly be considered a common ritual if it weren't for the rule book example and the fact that the people performing it were practitioners.
It's the definitive common ritual, I have no idea why the heck they gave those two characters Ritual.
Thomas is that one side story does something common ritual-esque too.
Anyway, it looks like they do get some use. Just not much.
Also the rules for common rituals do differ slightly from the normal temporary power rules.
Is anybody else slightly surprised by the fact that common rituals use Conviction and Discipline? I figured from what Harry says that they require no real strength or talent.