You can use this program to interact with the ADXL345 Accelerometer using your Raspberry Pi.
What you need is the python-smbus library, if you don't have this library installed yet you can install it using:
sudo apt-get install python-smbus
Once you've installed smbus you can import ADXL345.py in your own python programs. you have to make sure that ADXL345.py is in the same directory as your python program.
To import the library, add this to your program:
from ADXL345 import ADXL345
Please note that for this program to work you need to have i2c enabled on your Raspberry Pi.