Honestly, I think cleric (or druid or favored soul - pick one) should be on nearly every class' favored-class list. I mean, really. What race isn't going to benefit from having a priest/healer/shaman in their midst? What race isn't going to have someone paying homage to powers beyond their control?
Having said that, giving favored status to cleric, druid, or favored soul only further unbalances the divine classes. There is something wrong by further saying, "Go ahead and take a few levels of a class that the spells rock in and can be used to heal. And we'll even not make it hurt to multiclass!"