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some of these links (an old post I saved) may not work, didn't test 'em:

Where are the Ten Lost Tribes?
http://www.pbs.org/wgbh/nova/israel/losttribes.html

Here's an article about an earlier, similar show from Discovery, A&E, or History Channel (I forget which):

'Indiana' Jacobovici and the lost tribe of Israel
http://www.cjnews.com/pastIssues/feb12-98/feature/feature1.htm

Here's one about the YAP haplotype discovered in kohanin:

Y Chromosomes Traveling South
http://www.journals.uchicago.edu/AJHG/journal/issues/v66n2/990488/brief/990488.abstract.html

Very interesting, as Arte Johnson used to say. Here's what I said about the Lemba on an African history webpage I wrote last year:

Most of the West African kingdoms that came along after Ghana also gave their monarchs a foreign origin, usually declaring that an Arab or Berber founded the dynasty. Though possible, such stories should be taken with a healthy dose of skepticism, since the Arabs and Berbers are white, while these kings and their people were always black by the time historical records about them appear. Likewise, the city-states on the East African coast, like Kilwa, claimed that their first kings were Arabs. They probably made such claims to give the royal family an impressive Islamic lineage, just as the Christian kings of Abyssinia claimed descent from Solomon and the Queen of Sheba (see Chapter 4).

However, in at least one case such legends may be correct. In 1999 members of the Lemba, a small South African tribe that claims Jewish ancestry, submitted to DNA testing, and their men have the so-called "Cohanim gene," a structure on the Y chromosome that so far has only been found with Levites. White Jews are debating whether the Lemba are really Jewish as we go to press, just as they did when Ethiopia's Falashas moved to Israel in the 1980s.

Source: http://xenohistorian.faithweb.com/africa/af05.html , footnote #8