We use LR and I think that helped a lot with the speech ability of my daughter. I teach my D english as a second language but I wouldn't say we are a bilingual household. It is becouse you are a real bilingual family it takes longer for your D to speak.
I think we didn't like he TW DVD's at first and if she could choose she would choose Sparkabilities over TW as well

.
As for the activities we do a lot of flashing inspired by TW/Doman and physical activities inspired by the Sparkabilities videos/Doman and ASL.
Have you read any early learning blogs? Try to read ShenLi's blog
http://www.figur8.net/resources/right-brain/.