I am very interested in this subject so I am adding comments to it in order to subscribe to this thread.
Here are some personal factoids:
99+% Eastern European Ethnicity
Y Chromosome Haplogroup I2a with a terminal SNP of I-Y4882*
Mitochondrial DNA Haplogroup T1a1b
An up to date web page with the latest information related to genetic genealogy and my personal test can be found here:
Much to my surprise I have made contact with members of my ancestral family through this means. I have also found connections to Y DNA blood lines from Poland going back approx. 1500 years.
I have put together this web page to discuss my dna testing and its relationship to my Polish heritage.