For rangers, drop the companion and spells, and gain Sneak Attack against favored enemies. That would give Hide and Move Silently an excuse for being on the Rangers class skill list. Limiting the number of sneak attack dice to the bonus of the favored enemy is a good way to limit this if it seems to powerful.
For druids, make Summon Nature's Ally their domain spell, so they get one free casting of it at every spell level. A druid that summons animals to them for assistance makes more sense than one who has a wolf up his butt at 15th level. Seriously, no matter how many bonuses the wolf gets off the ability list for animal companions, it still sucks. It sucks as a 1st level companion, and by the time you can get anything better, that sucks too at your new level. At least with SNA, you don't have to feed the worthless thing or provide it with magic items to aid its survival... IMC, animal companions, and sometimes even faniliars, are mostly forgotten tag-alongs that eat food better used to bribe orcs.