Picasa Express x2 plugin by wott allows browsing Picasa Web album and select image to insert or select several images to the gallery
Use Picasa user for get albums ( username can be stored in settings )
Show albums cover and name for get images.
Images from album with caption or filename for selection
Select and insert single image or banch for gallery. Enhanced
Private Picasa albums after granting access via Google service
WordPress MU support – sidewide activation, users, roles
Gallery shortcodes for selected images or for get all images from Picasa album
Download and info: http://wordpress.org/extend/plugins/picasa-express-x2/