I don't know of any sites, but I have some comments.
I have heard that a lot of winners do not know how to invest or save their money so 10 years later they are broke.
I think it would suck to win the lottery after you turn 60 years old even though you would have the satisfaction that the rest of your immediate family will not be hurting for money.
I know a family that won a few million and they didn't move from their $150K house they just updated it and they go on trips ALL the time.