Drop Box album

The Drop Box is an online album that serves as a holding pen for several types of quick photo uploads. The Drop Box won't be visible in Picasa Web Albums until you've actually uploaded a photo into it. Once you've uploaded photos to your Drop Box, you can easily move these Drop Box photos to other online albums. Photos can be added to the Drop Box from Picasa, orkut or your mobile phone:

Mobile phone

Use email upload to stream photos from your mobile phone to your Drop Box.

Picasa

You can upload single photos to the Picasa Web Albums Drop Box at original size from both Picasa (using the Upload to your Web Albums Drop Box button drop box while editing photos) and the Picasa Photo Viewer (Using the Upload button).

orkut

When you add photos as orkut scraps, these photos are saved in your Picasa Web Albums Drop Box.