Hi K.,
We invested in the Illinois 529 Plan called Bright Start. We went through other options with our financial adviser, but this seemed to be the best option for us.
The more money you can put into these up front, the better off you will be. Keep in mind, though, that if you take it out early you will have to pay some serious taxes...be sure that what you put in can STAY in until college time :)
Also, I believe that these plans are "transferable" Lets say that your son becomes a super famous something-or-other and makes millions of dollars before his college years...or just chooses not to go ;-) ...you can use the money for continuing education for yourself or your husband, pass the money on to another child, or even a godson/goddaughter etc.
I also believe that money put into the 529 can be used for things other than tuition as long as it is school related like room and board, books, meal plans etc.
I would suggest that you call a financial representative to discuss: we use one from Northwestern Mutual (you can look up someone in your area on their website: www.nmfn.com). An important thing to note is that these advisers are free of charge to you--there are no fees to use them because they are paid on commission by whomever you buy the policies from. They can give you advice on college, but also any other financial concerns you might have (life insurance, estate planning, retirement planning etc).
Good luck!