There are 2 types of plans. One is 529 plans. You can invest tons of money into these plans. The money grows interest free year over year. My understanding when these plans were created is that this money is NOT included when colleges go through financial aid planning. Maybe it's changed, and one responder said it is included, but that's not my recollection.
If you are lucky and have parents looking to find a place to put some cash, they can put a nice amount every year into a 529 plan. That's not my situation, so I don't know much more than that.
Pretty much each state has a 529 plan. You can invest in any one states 529 plan and go to college in any state. For Illinois, if you invest in the Illinois 529 plan, you get a little write off on your State Income Tax. Check our SmartMoney. They are a magazine and a web site. They've evaluated all the states and have picked the top ones.
You can change the name of who the 529 plan goes to. Having time on your side for an investment helps. We opened 529 plans before our children were born, and put them in our own names. Then after our kids had SSNs, we transfered the account to them.
We're hoping our kids go to community college for 2 years and then finish at a 4 year school. But if they decide to go to a trade school or not need all the money, we can transfer the balance to basically anyone.
I'm less familiar with the other pre-paid tuition program.
Investments are investments. Either get knowledgeable about it, or talk to someone who is (a certified accountant). It wouldn't cost much to talk to an accountant, and get you on the right track.
Comparing all my investments in the stock market over the past year, they've all tanked. The other way to think about it is that I was buying low, and hope to get a pay out when it's high.
Good luck!