isiXhosa is one of the official languages of South Africa. There are 7,907,153 (17.64 %) first language speakers [2001 census data].

isiXhosa is a member of the "Nguni" language group, and is most closely related to isiZulu, isiNdebele and SiSwati.

isiXhosa (Xhosa) language family tree.

Books

English-Xhosa Dictionary (Arnold Fischer)
[ Buy from Kalahari.net | Buy from Amazon.com ]

The Greater Dictionary of isiXhosa. "A comprehensive trilingual (IsiXhosa, English, Afrikaans) dictionary that promotes multilingualism and indigenous languages was launched on the 22nd of September 2006, at the University of Fort Hare."
[ Nutrend (publisher) link ]

South African Oxford Multilingual Primary Dictionary (Nguni) (OUPSA)
[ Buy from Kalahari.net | Publisher link ]

Proverbs

• 
  Xhosa Proverbs (Zolile Calana)
  [ Buy from Kalahari.net | Buy from Amazon.com ]

• Web-lingo South African based online translation service offering general and technical translations, development of multilingual websites, and software localisation services.
• Folio Translation Consultants "specialising in African, major European and Asian languages".
• Jako Olivier Language Services "For fast, reliable and quality translations between English and: Afrikaans, Ndebele, Northern Sotho (Sepedi), Otjiherero, Sesotho, Shona, Swahili, Swati, Tsonga, Tswana, Venda, Xhosa and Zulu."
• Asterisks.com Editing and Translation Services Online. Specializing in the 11 official languages of South Africa.
• Lingua Consultants specialize in the medical, pharmaceutical and chemical fields in European and African languages.
• Multilingua Translation and Interpretation Services

• Umhlobo Wenene FM

Language courses

African Voices
produces multimedia CD-ROM lessons for isiXhosa and isiZulu. These can be ordered directly from African Voices in South Africa, or can also be purchased from Amazon:
Speak Xhosa With Us (Book & CD-Rom...)

Teach Yourself Xhosa Complete Course...

Projects

http://www.translate.org.za/
A non-profit organization translating various OpenSource software packages such as OpenOffice.org and the Mozilla web browser into all official South African languages. They have released isiZulu, Sesotho sa Leboa and Afrikaans versions of OpenOffice.

isiXhosa Wikipedia

Miscellaneous

Google in isiXhosa