CardCaptor Sakura (Kado Kyato Sakura) is a shoujo manga created and drawn by CLAMP that was running in a monthly magazine called Nakayoshi. Nakayoshi is a shoujo phonebook magazine that is aimed toward 6-12 year old girls and is also the same magazine that had Sailor Moon, Magic Knight Rayearth, St. Tail, and many other stories too. There are 12 volumes, and 3 artbooks. The publisher is Kondansha Comics.
For each manga volume, Sakura is the cover girl and posing in a cute outfit. Inside there are 2 cover pictures, located as the first and last pages and depending which volume it is, features a single character (such as: vol. 1 is Sakura, vol. 2 is Tomoyo, vol. 3 is Syaoran, etc). There's also a bookmark too (very helpful for reading ^_^). The bookcovers are pink and shouldn't be too hard to miss when browsing through your local Japanese Bookstore =P