Alison,
I sent this in an email to the editors, but would like to mention it here:
You made some great points about the MPAA rating system (the film "This Film is Not Yet Rated" explains why they are completely ridiculous).
I would suggest using www.kids-in-mind.com as a great resource for determining whether a film is right for your children or not. Check it out. (it's not my website or anything...I just use it).
Thanks and keep up the good work. I have discovered many a gem of a small film by watching you guys.