The Clan has selected FamilyTreeDNA in Texas for its DNA Study. They have provided an excellent explanation of DNA testing in one of their newsletters however you may also wish to consult their Frequently Asked Questions (FAQ) link.
CLAN MAP OF IRELAND (Commercial Site)
The most indepth and accurate Clan map of Ireland ever produced. It is based on the location of nearly 1,400 Castles with a known historical association with a particular Irish, Scottish, Gallowglass, Norman, and Viking Clan or Family.