We took the Ford Focus into the garage yesterday for a bad wheel bearing again. It turned out to be the same one we had replaced about a year ago (rear, passenger side). The good news is that it was still under warranty so it didn't cost anything. Not sure why it went out again though. Anyway, now it's fixed. [NOTE: it makes a hum or buzz sound that increases with speed]
They also said that we may want to replace the back shocks soon. The back tires are "cupping" a little. The front struts were still within their limit. Shocks aren't as expensive as struts, so more good news... sort of.