I have Winthrops (although scetchy) back to Adam and Joan Burton.I have a first additon of "The Winthrop Woman" by Anya Seton. As well as John Winthrop Sr. "The Journal of John Winthrop 1630-1649 Abridged Edition" Edited by Richard Dunn and Laetitia Yeandle.So yes I am aware of the connection between Elizabeth et al :).....
What I have on Jacksons, came from the book written by Ocar Burton RobinsThe Decendants of Robert Jackson and Agnes Washburn, but I only have copies of pages that belong to my connections McCartney>Jackson>Hallet
I would love to hear from you and share, what I have (which is probably not near what you have) as I have only been at this for about 5 yrs.
If you will email me privatley that would be great.