Q: I love Google Picasa – over Apple's iPhoto as it is cross-platform – but it has one fault: it creates .ini files and duplicates in hidden folders – which messes up syncing with the iPad/iPhone. I usually use a tool on Windows to remove those hidden .picasa files and folders. Unfortunately I have no idea how to do this on a MacBook with OS X, expect to remove them file by file with the Terminal.app.
Thanks for the question! We've done a little leg work and found the reason for those Picasa.ini files (Windows and Mac) - they contain a record of the unsaved changes - like edits, stars or rotations - that you've made to your photos. All unsaved changes made within the same folder of images will be saved in a single hidden '.picasa.ini' file in the same folder. The '.picasa.ini' file serves as a backup to Picasa's photo database for all of your unsaved changes.
Should your database become corrupt, Picasa uses these '.picasa.ini' files to rebuild your photo database. In general, it's best not to remove the '.picasa.ini' files unless you're permanently uninstalling the software.
As for the dupes, we recommend following Google's tutorial on hunting down those dupes and deleting them. Unfortunately, it seems there's no automated tool - you'll have to do this one by one.
Hopefully that helps!