My two are in French Immersion, and I speak a bit of it, so I'm mulling over what I'm going to do for DS8 over the summer who is weaker than DD10. I know this won't help you, but DD10 suggested we have an hour a day of ONLY French speaking in the house (since they're in early immersion, one hour is less that what they'd normally have during the school year). DD10 is close to fluent and DS and I can squeak by.
I find Babylon translation handy:
http://translation.babylon.com/english/to-french/I also try and expose my two to French media (tv & radio) but I'm not sure what you have in your area (although you could search YouTube).
Gotta run... but I may be back, as I am figuring out summer stuff for my DS and will be trying to generate my own ideas...
