Arabic

Arabic is spoken in the Middle East, North Africa and
other countries, for example: Algeria, Bahrain,
Chad, Comores islands, Egypt, Eritrea, Iraq, Israel,
Jordan, Kuwait, Lebanon, Libya, Morocco, Oman,
Westbank & Gaza Strip, Qatar, Saudi Arabia, Somalia, 
Sudan, Syria, Tanzania, Tunisia, United Arab Emirates, 
Yemen.
Approximately 215 million people speak Arabic as their
native language, besides it's also the language of Islam.
Arabic is part of the Semitic language family, so there are
similarities to e. g. Hebrew and Amharic.

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Information

Sentences for travellers

Overview of the Arabic alphabet

Learn to write Arabic

Course in standard Arabic (with Audio)   

Another Course

Course in Syrian Arabic

Yet another Arabic Course (French site)

Grammar

Exercises

Quiz

Another Quiz

Free help translating a phrase from/to Arabic

Professional (paid) translations from/to Arabic 

Resources for offline learning:
Arabic electronic dictionaries, translators & software
Standard Arabic: elementary-intermediate course

Teach yourself Arabic
Learn Arabic the fun and easy way
Arabic-English dictionary
Read & Write Arabic
More from Amazon.com...
Arabic products from worldlanguage.com

Other:
Tongue Twisters in Arabic
Swearing in Arabic
Arabic music
The Bible in Arabic
Jokes in Arabic
Lots of resources