That's very nice, The Rubaiyat of Omar Khayyam on-line and illustrated by Edmund Dulac and Willy Pogany. (via Plep)

The Rubaiyat is not a single poem, but is rather a collection of verses written by or attributed to 'Umar Khayyam, the Persian mathematician, philosopher and astronomer who lived from ca. 1048 - 1122. This site presents several editions of the popular Edward FitzGerald adaptation, as well as a more substantial translation by E.H. Whinfield.

The Rubaiyat of Omar Khayyam can also be find at Wikisource, at Project Gutenberg translated by Edward Fitzgerald and Richard James Horatio Gottheil, and The Rubaiyat, with analysis, different translations, comparison and vocabulary.