Hi Kevin,
Though I haven't used it in a long time, I know Picasa is a popular service.

Thanks for the kind words about the Google Docs and Google My Location videos. Something to remember is that we were hired by Google to create those videos - we didn't do them on our own time. This photo sharing video is for The Common Craft Show, so we were not hired to produce it. This makes our motivations in highlighting sites different.

From our perspective, Picasa is a slightly different breed than the other photo sharing services - it's a software tool and a web site for sharing. I appreciate you bringing it up!