I totally agree about all the wonderful things this programme can do but there are two very irritating things for me. One is it seems to make multiple copies of photos, on a whim as far as I can tell. The other is that once you have changed/deleted one, you can't get it back. I'm talking about the fact that Picasa takes over any other photo folders you may have. We like to store all our pictures in a file on the PC, just as we took them, they are the 'master' copy if you like.. Picasa doesn't only change the ones imported into Picasa, it changes all copies wherever they are on the computer. If I could find a way to stop it doing this I would be pleased to learn it. Probably I need to be more methodical about renaming files etc., but with my memory!!! A 'Save as' button would be very useful but I have not found one on Picasa yet...
Something that I do, that might help you, is when I want to CROP a photo, I select the photo and then go to the FILE tab at the top of the screen and select SAVE A COPY - BEFORE I BEGIN TO CROP. This will put a copy of the file with the (-1) after the name. You can then have your original AND the new cropped photo. I haven't noticed it making multiple copies of the photos.
Calif_Sue Northern California United States (Zone 9a)
Now I do things totally different. I make the changes to an image, then click the Hold button in the bottom bar and when I am done with all the changes, I click Export and those changes are now exported into a Picasa Exports file, either in their original size or for my use, a smaller size. The original images are untouched in the My Pictures folder.