Give the RSS url of your Picasa album(s) to the Picasa for WordPress widget to display them in your sidebar(s).
add slideshow widget(s) in the sidebar(s) section of your page,
you'll can change the width of your slideshow (the height will be automatically adjusted), the background color, the autoplay feature, if only registered users can see it, if you want to show the legend,
internationalization of the plugin,
tested and working on IE6, IE7, IE8, Firefox, Opera, Chrome, Safari,