One of the most common poems, memorized by almost every schoolchild in China, is “Jing Ye Se” by Li Bai. Watch an animation on YouTube:

Here is the poem, in simplified characters with pinyin, followed by the English translation:　

　　chuáng qián míng yuè guāng
　　床 前 明 月 光，
　　yí shì dì shàngshuāng
　　疑 是 地 上 霜。
　　jǚ tóu wàng míng yuè
　　举 头 望 明 月，
　　dī tóu sī gù xiāng
　　低 头 思 故 乡。

Before my bed, the moon is shining bright,
I think that it is frost upon the ground.
I raise my head and look at the bright moon,
I lower my head and think of home.

This site provides a nice version of the poem, with pinyin and English translation as you hover the mouse over each character.