This was the generated url which failed at picasaweb:
http://picasaweb.google.com/data/feed/api/user/info@hellehond.nl/album/Hellehondsdagen2010HellepoortOpzetten?kind=photo&thumbsize=144c&start-index=1
It returned the following data:
The Picasa API is deprecated. See https://developers.google.com/picasa-web/ for more details and the migration guide.