As promised, here is a quick overview of what I have found on the web about Serendipity in Genealogy. Again, plenty of well-respected people.
.olivetreegenealogy.blogspot.com/2008/02/serendipity-in-genealogy.html one story
http://www.familytreemagazine.com/ancestornews/serendipity.html one story, pointers
The genealogist is left with a feeling of awe, as if his or her ancestors are helping with the search.
http://www.geneamusings.com/2008/05/magic-of-genealogy-moment-genea-gasm.html one story
http://ancestryinsider.blogspot.com/search/label/serendipity Check on the right. list
http://seattletimes.nwsource.com/html/travel/2004388219_travessay04.html one story
http://ancestryinsider.blogspot.com/2008/04/serendipity-in-genealogy-and-telly-goes.html Hank Jones
I love Randy Seaver's term for it. A genea-gasm.
Henry Jones discusses in his books how he doesn't mean to discount real research practices. Good genealogy research needs to be done in a scholarly way, with real, solid, evaluated research steps. But that is the beauty of this topic. You go about it in a systematic way and every once in a while you catch an incredible break. It is really awe inspiring. To me, the serendipity shows how important family history is.
Do you know of more stories?