Google Picasa API: No way to get an image direct URL?

After spending some hours of fighting with the Google Picasa API (with the help of Pedroafa), we have found that appears to be no way to get a photo URL to use for example as the src attribute of an <img> tag!
Every URI on the GData query either returns a HTTP address (for viewing the photo in Picasa Web) or the image but "pushed" so you have to download it :(

Tomorrow we will do a second round trying alternative ways, and I suppose the reason is to avoid direct linking of the images outside Picasa, but the option to link directly to the image should be available...