WordPress.org

You can use ESPR!T Picasa to add photos from google Picasa albums to your post and pages. Just click on ESPR!T Picasa photo tab icon when editing post or page, select the album and then with one click just insert the photo into your post. The photos are still being hold on Google Picasa album, the plugin just insert pure html link into the post. You can also take advantage of Lightbox effects, but you do need to install separate plugin for lightbox.