Indo european genetic markers: Y-DNA Haplogroups

I would like to start a topic regarding the possible indo european Y-DNA Haplogroups:

Today European Distribution:
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http://www.eupedia.com/europe/european_y-dna_haplogroups.shtml


Some of the main candidates are:
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R1a
http://en.wikipedia.org/wiki/Haplogroup_R1a_(Y-DNA)

R1b
http://en.wikipedia.org/wiki/Haplogroup_R1b_(Y-DNA)

I1 former I1a
http://en.wikipedia.org/wiki/Haplogroup_I1a_(Y-DNA)

I2 former I1b
http://en.wikipedia.org/wiki/Haplogroup_I1b_(Y-DNA)

Marius