Selecting sensor or load cell for measuring weight

hi,
I am playing with Arduino for a while, Now I am planning to measure the weight of books in a shelf (up to 25 kg). I am confused in selecting the sensor which meets my requirement. can anyone suggest me suitable sensor or load cell which can be interfaced with Arduino for implementing it ? Also please provide me some guidance or links on interfacing the sensor with Arduino ?

thanks in advance
Avinash