After the Holidays, you will probably receive invitation from friends or family members to view their online photo albums, while you can download pictures as you select one by one, there has not been an easy way to download all the pictures from that album at once.
Fortunately I ran across this small utility called picasa-webalbums-assistant, the small Java utility allows to download public albums by UserID or by copying and pasting an invitation link (for private albums). Thumbnail previews allow you to download only the photo’s you want.
Note: If the invitation comes with a country code, example http://Picasaweb.geegle.fr/…. , just, replace .fr to .com
Download HERE!. You just need java 5.5 or later to run it.