Thanks for the tip on WorldCat. I have used that before and am currently collecting potential books to check out to make the travel more efficient. It is amazing how many books are out there. Do you know of any repository or forum that identifies known errata of published genealogy books?
For example, this site(
http://www.ancientwalesstudies.org/) provides analysis of Welsh Genealogy that is interesting and well sourced.
Right now I am cleaning up my tree. Ancestry.com has easier ways to add people and find hints (but huge piles of un-sourced entries to wade through). But I find Ancestry.com to be cumbersome in adding source detail, pruning, problem finding, analysis and research notes. RootsWeb has some really good tools for that. So right now I am using Ancestry.com to find and explore and RootsWeb to verify and document.
I am also starting with me and going back in time to make sure I have solid evidence for each person in the tree. I found out there are way too many errors in family trees, family birth collections, millennium file and other "sources" of those types and have had to do some pruning. Some are good places to start for further research, but there are so many obvious errors that I dare not rely on that alone. Which is why I am going back through the tree with a deliberate and careful analysis.