Singing the Praises of Brainpop
The movie selection is enormous. In addition to science movies, there are movies on every part of history. We also watch the technology movies. The other day we watched one on the MP3 player. Haven't you always wondered what they REALLY are?
There are also some excellent movies on puberty and thing like your period. They are very tastefully done.
The only drawback is they have an evoluationary bent. This isn't uncommon in any secular science curriculum and can easily be discussed with your kids.