Thanks for the great plugin. I was trying to figure out the captions functionality and noticed there were several questions about it.
Picasa captions on photos will be pulled by doing the following:
Go to Settings/Picasna and “Show” – Show or hide the title on the initial cover thumbnail. This turns on and shows the title of the link that was specified when you place the picasa link on your page or post. Example: a href = http: //picasa.google.com/USER-NAME/ALBUM-NAME/">TITLE OF LINK
The TITLE OF LINK is what will be displayed on your Photo album on your WP page or post.
Also, for those who can’t get the plugin to work, make sure you take off the http”S” on your picasa link and the # at the end.
Works like a charm in WP 3.1 for me now.