Questions. Ask lots of questions. Model proper language for them and ask them thinking questions. Even if they can't speak yet, talk to them. I can't stress the importance of reading enough. I have memories of my mom reading to me as a child as well as some of the books she used to love. Studies show (from what I remember from school) that children that are read to at home tend to do better in school.

I have tons of websites for activities for little kids. Kids at a young age learn the most through play. Playing with other kids, individual play, group play activities, and activities where they can use their imagination.

Make a deal with yourself to turn of the television and "do" something with your kids.

You care, that's the most important thing. Let me know if I can be of more help. I applaud you for trying to change habits you don't like.