There are two languages called Ndebele: Southern Ndebele and Northern Ndebele. Both are part of the Nguni group of Bantu languages, but they are not very closely related.
South Ndebele (isiNdebele) is spoken by about 590,000 people in South Africa, where it is one of the official languages. There are two dialects: Northern Transvaal Ndebele (Nrebele) and the Southern Transvaal Ndebele.
Northern Ndebele (Sindebele) is spoken in Zimbabwe and Botswana by about 1.5 million people. It is closely related to Zulu and mutually intelligible with it to some extent.
Information on Ndebele pronunciation compiled by Wolfram Siegel
Abantu bonke bazalwa bekhululekile njalo belingana kumalungelo abo. Balesipho sikanembeza, ngakho bamele baphathane ngomoya otshengisa ubuhlobo lobunye.
Information about Ndebele languages
http://en.wikipedia.org/wiki/Southern_Ndebele_language
http://www.sa-venues.com/language-ndebele.htm
http://en.wikipedia.org/wiki/Northern_Ndebele_language
http://mthunzi.netfirms.com
Northern Ndebele dictionary
http://www.northernndebele.org.za
Akan, Bambara, Bamum, Bemba, Chichewa, Duala, Ewe, Ewondo Ga, Ganda, Herero, Igbo, Kirundi, Kpelle, Lingala, Mende, Ndebele, Northern Sotho, OshiWambo, Shona, Southern Sotho, Swahili, Swati, Tsonga, Tswana, Tumbuka, Twi, Venda, Wolof, Xhosa, Yorùbá, Zulu