Do check Rootsweb. I have found several family trees posted on Rootsweb that are not on Ancestry.com. I think people are more likely to put their trees on Rootsweb because it is free and not everyone can afford Ancestry.com. Really the two sites complement each other, use both. Also I'm not sure but I think Rootsweb has been around longer, as some trees have been on there quite a long time, and that was very helpful.