These are GREAT ideas, everyone. Thanks!
This encounter will be taking place within the Shudderwood in the middle of winter, so conditions will heavily favor the wolves (snow, brush, poor LOS, etc.) I had forgotten about targeting horses, but that is a great idea. Waking up to a screaming animal in the middle of the night should be good atmosphere.
One question about harassment tactics - I know wizards need 8 hours rest, but what about clerics/witches? What about ki pools and the like? Can they be prevented from regeneration by not getting a night's sleep?
I like the idea about splitting the party with a stream. I will have to design a nice choke point.
You're probably right, therealthom, about the Wolves not hitting and needing more numbers. The way I've got it set up, Wolves are the most common encounter for the travel. Once the wolves start following, every time I roll wolves again the pack will be joined by more wolves, or even dire wolves, winter wolves, or werewolves appropriate to the area.
I don't want to soup up the normal wolves too much, as I still want them to seem like animals. I might make them a little tougher than a regular wolf - call them a "Shudderwood Wolf" and give them full hit points and maybe a +1 morale bonus to hit/dmg due to being all riled up by the events in Broken Moon.
Logan, the Howling/hunted feeling is right on - that's the effect I'm going for.
I really, really like Nebelwerfer's suggestion of harassment attacks - make the PCs groan and say "time to scare the wolves off again" then hit them with the full pack.