Although not a descendant of Richard Warren - I am recognized by the Mayflower Society as being a descendant of Isaac Allerton, Richard More and William White - I may be able to help with your query in a small way. (see my posting history for lines we might have in common)
I and a Wikipedia editor just updated almost 60 Mayflower-Plymouth Colony-related Wikipedia articles, one of which is for Richard Warren - this may help a little: http://en.wikipedia.org/wiki/Richard_Warrenhttp://en.wikipedia.org/wiki/Richard_Warren
Regarding famous persons who might be descendants of Mayflower passengers, I do know the Mayflower Society on its home page has a link to what famous persons descend from them, but no indiviual trees.
For who may be associated with your own tree, aside from what good/bad information may exist on-line, a professional researcher may be able to provide definitive assistance, if that something you want to persue. The following is a professional genealogical researcher who I can highly recommend: http://annmcrodenmensch.webs.com/http://annmcrodenmensch.webs.com/ https://sites.google.com/site/annmcrodenmensch/ Ann's resume speaks for itself.