Hands Down best one i have use is Picasa Express x2
- Use Picasa user to 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
Additionaly setting is managing:
- Image link: none, direct, Picasa
image page, thickbox,lightbox and
highslide with gallery - Sorting images in dialog and in
inserted gallery - Caption under image or/and in
image/link title - Alignment for images and gallery
- Additional style or CSS classes for
images and gallery - Define Roles which capable to use the
plugin - Switch from blog to user level for
store Picasa user and private access
token
And by design:
- Support native WordPress image and
link dialog for alignment, caption,
description, style and CSS class - Thumbnail images size defined in
WordPress native properties - Multilanguage support
Another good one would be Picasa Albums which uses the new “custom post types” feature.