French language summer programs for kids?
 

My 8 yo son is in a french immersion school, but in need of some serious everyday practice. We're considering spending part of next summer in France to try and improve his language/comprehension skills, but don't know where to look for day school/ summer programs for kids, esp. anything that might be good for non-native speakers.

This is probably not what you are looking for but there's a program called Concordia Language Villages which operates in Minnesota and may work for you. They do immersion-type programs both in Minnesota and overseas, if I am not mistaken. The one's in the US children seem to love and do each summer year-over-year.

http://clvweb.cord.edu/prweb/

Another vote for Concordia
 

My son did the French camp a few years ago and loved it. The moniteurs are generally college kids from France and have tons of energy to deal with kids. Plus, the food is awesome. The only downside is the "Minnesota state bird" - the mosquitos.

P.S. As a kid, Chelsea Clinton spent several summers at the camp.

This doesn't answer your question about language schools, but have you been to Alliance Francaise in San Francisco? They have a library to check out French videos and books, and perhaps even you could hire one of the instructors for an hour or two a week for practice.

http://www.afsf.com/

My children (12 and 16) are fluent (more or less) in three languages each and can get by in another one or two. If you want your child to learn, put him in a regular camp in France. Make a point to ask that they _never_ speak English with him. You can find a list of French camps here: http://tinyurl.com/apyw9
This is not a definitive list, just something I picked up quickly. As I child/youth I spent time in other countries and usually left fairly fluent provided people only spoke to me in their language. I think you would make a mistake to look for a camp "good for non-native speakers."