In Picassa, there is an "import" button, located at the top left of the screen, just below "File" "Edit" and "View".  I have my camera connected to the USB and when I click on Import it opens a new screen and displays all the pictures in the camera.  It has options to select all or just some of the pictures.  It also has options to delete the pictures in the camera after import.   If you click on the Help Contents in Picasa and then search for import, it will give you directions on how to do it.  Basically what I stated.
How do you uninstall TIFF as the default Photo Display Program in Windows XP 
PRO?