Use Picasa LightBox to add Picasa images to your posts and pages. You can do this without using any custom tags. Just click the Picasa Photos tab, browse your albums and select the picture you want to insert. Picasa LightBox does not download your Picasa images to your server. Instead it displays them directly from Picasa. Picasa LightBox currently supports only public Picasa albums. Picasa LightBox inserts pure HTML code into your posts or pages so you can easily customize it to fit your needs.
Full support will be handled at the Picasa LightBox website
Free Download: Download this wp-plugin