It's the week of the slideshows at Google. After the Gmail slideshow for presentations, Picasa Web lets you create a sleek slideshow for each one of your albums and embed it in your blog. It's not as hot as Monoslideshow, but it doesn't cost $20 either.
The options is available only for your albums (both public and unlisted), but if you change the albums ID and the username in the code you could use it for any album from Picasa Web.
Google's photo screensaver