Yes, there was also a manga. By Clamp. And my frank opinion would be that the anime was better. In fact, i would urge people to watch the anime before reading the manga. It would be a better decision.
And by the way, in the manga, there is no...whats-her-name...that Li's chinese girlfriend....whatever her name is >_<
Ten-year-old fourth grader Sakura Kinomoto opens a mysterious book in her father's study and accidentally releases the magical Clow Cards. Created by the half-English half-Chinese sorcerer Clow Reed, the Clow Cards were sealed within the Clow Book upon his death and represent a combination of magic from Clow's mixed heritage. Each card has its own personality and characteristics and can assume alternate forms when activated.
there were 12 volumes and about 50 chapters.