Hi again!
I noticed this strange behaviour:
I set Yawcam to save images when motion detection is running in a folder I chose, but I discovered it also save images in the default folder:
C:\Documents and Settings\User\.yawcam\motion
These are saved so that when you check the motion activity in Yawcam, you will have a preview as well. I'm not sure though if clearing the activity list removes those pictures as well.