For genealogy, limited genetic testing can be very beneficial.
Genetics and Genealogy Our Story and My Genetic Testing Reviews
http://tamarawilhite.hubpages.com/hub/Genetics-and-Genealogy-Our-Story-and-My-Genetic-Testing-Reviews
How? If you suspect that that person buried in 1925 was your great,great something are you gonna dig him/her up to get DNA?
The main draw among genealogists appears to be, am I really related to all these collateral line multi-removed cousins — and it turns out, much of the time the answer is “no”. The paper trail says one thing, the genetic woodpile says something else.