We saved up $20,000 for each child, any amount above that is interest added. If DD wants to go to an expensive college, she know that she has to make the grades for scholarships, or she can work part-time. DH & I both put ourselves through college and I feel that our children will value the experience more if they work for it.
I'm not sure that will be possible by the time your kids are going off to school. My older brother had a deal with my parents that he had to pay his tuition and they would pay for his room and and board (worked out to about a 40/60 split at the time). He worked part time during the school year and as many hours as he could pack in on breaks and over the summer. Didn't spend a lot on "fun", saved around 95% of what he made.
His senior year, he couldn't come up with enough money for his share. He worked like a dog but just couldn't scrape up enough cash. He told my parents he was going to take a semester off to work full time to get the remaining money. They were affraid he may not go back and finish, so they loaned him what he was short and let him pay them back after he got his degree.
This was in the early '90s, and if a hard working young man couldn't scrape up enough cash to pay just in-state tuition (not even room/board) then I'm guessing it's all but impossible now. A student that has parents that cannot or will not foot the bill will almost have to take out loans. And scholarships are fiercly competted over. Your kid could have a 4.0 and fantastic essays and activites resume, and still not get much in the way of scholarships.
My plan with my own future children (should I have any) is that I will pay for tuition and room/board. That's it. No books, no lab fees, no car insurance, clothes, dorm supplies, beer money, or any other "nickle and dime" fee or expense. That they need to take care of on their own as their contribution to "the cause". And that's if they go to an in-state school. If they go out of state or to a private school, I'll give them the equivilent in-state tuition/board and they are on their own for the rest. In addition, I only write next semesters tuition check IF, and only if, I see their report card and I'm happy with it. No kid is going to party and let their grades slide on my dime.
IMO, this makes them responsible for at least some of their expenses while not making them work a ton of hours when their main focus should be school, and puts them on notice that if they come to me with a 1.5 average, the money dries up and they either leave school or start taking out loans.
Every family needs to do what they think will work best for them, and a lot of families may just flat out not have the money to help with school. But I think if parents have the money to spare, helping their kids with college can take a huge burden off their kids, and there are ways to do it so the kids don't take advantage of the situation.