I have arduino duemilanove,and a temprature sensor which works fine even with pachube.Now im just wondering if there is an easy to log sensor data directly on the computer. was thinking maybe to a text file which i can export to excel or other graphing tools.
Have you looked at Processing (Arduino Playground - Processing)? If you are willing to write some code, you can use Processing (essentially Java) to read serial port data sent from Arduino and log your data there.