A most important field that will aid you in your genealogy research is Genetics - the ancestry genetic test. Genebase.com and 23andME.com are the 2 companies many Sri Lankans are using to find information about their ancestry, as well as to find long lost relatives.
One question that can be answered by taking this genetic test is: are you related to important historic figures in Sri Lanka. Another question is: Is that other person that has the same last name as me related to me.
(Many Europeans, North Americans etc. have been taking these tests. Oprah Winfrey, National Geographic, and PBS tv did shows about this topic. And, many North American tv programs showcased Dr. Spencer Wells....the foremost authority on Genetic Genealogy. All these shows can be viewed through either Youtube or other websites).
The study we are involved with (reason for ancestry genetic tests) is to find out about the last name Samarasinghe.Are Mudaliyar Samarasinha and Ratemahatmaya R.M. Peter Samarasinghe's descendants related?we have been doing genetic tests using Genebase.com's paternal DNA tests.
I noticed (from observingunrelated people's results) that Sri Lankans who have taken these tests are getting surprise results..... finding out that they are not 100% Asian.Genebase.com only gives your maternal or paternal haplogroup (which shows you where your paternal or maternal DNA came from). 23andME.com show you the exact percentage of Asian,European, African, etc. that you are.
[So far, i have used both Genebase.com and 23andMe.com for my research].