Recently Picasa 3.8 has been released with some great new features, one of the most awaited features which was batch uploading of photos and albums has been added to picasa desktop version released. This means that you can upload multiple albums all at once to Picasa Web Albums, see what you have already uploaded to Picasa Web or have already uploaded at a low resolution.
Follow the procedure to know how to do batch upload to picasa web albums
1. Download and Install the latest version of picasa from here or update the existing version of picasa to 3.8
2. Under File Menu Tools >> Batch Upload as shown in the image below
3. Once you have selected this option, you will need to select the folders which you would like to upload online to picasa web albums as shown in the image below.
4. Once you have configured all the options like action, uploaded options then you can click ok to start the uploading process.