ytv.com
All Sarah Jane Adventures episodes will be found on SurfTheChannel.com.
Zulu.com
www.surfthechannel.com
you can watch it at sidereel
Well you watch it on t.v and don't miss the episodes if you want to see it that badly.
You can watch some full episodes on nick.com. There's usually at least three or four episodes on TV every day.
hulu.com has all full length episodes
I'm pretty sure you can watch them on ABC.com
Youtube has some episodes up.
go to movies-links.tv
Youtube .....