The Rubaiyat by Omar Khayyam - http://classics.mit.edu/Khayyam/rubaiyat.html The complete text translated into English. Part of the Internet Classics Archive.
The Rubaiyat Of Omar Khayyam - http://www.iranonline.com/literature/indexbc-khayyam.html Online text of English translation by Edward FitzGerald (1809-1883).
The Rubaiyat of Omar Khayyam - http://www.everypoet.com/archive/poetry/Omar_Khayyam/omar_khayyam_contents.htm The Rubaiyat (an English translation) presented in a pleasant, readable format.
The Rubbayat of Omar Khayyam - http://www.intratext.com/X/ENG0044.htm Edward FitzGerald translation. Full text, with concordances and word frequency lists.
Omar Khayyam on Cubics - http://www.mathpages.com/home/kmath448.htm Questions and answers regarding algebra and geometry.
The Rubaiyat of Omar Khayyam - http://www.classicbookshelf.com/library/omar_khayyam/rubaiyat_of_omar_khayyam/ English translation (not Fitzgerald) with adjustable sized text and automatic bookmarking.
Rubaiyat of Omar Khayyam - http://www.okonlife.com/ Some verses in Persian, German, and three English versions (including Fitzgerald). Plus biography.
Omar Khayyam fan page - http://www.omar-khayyam.org/ Includes biography, dedications and his poetry.
Khayyam - http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Khayyam.html Biography of Omar Khayyam (1048-1122).
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