I am also looking for some documentation on using OAuth2 with Picasa. My server-side integration with Picasa recently broke and it looks like Google finally shut off the old ClientLogin and OAuth1 authentication methods. This is painful with Picasa because there aren't Picasa-specific libraries available (unlike a lot of newer Google products) so we are stuck with the ancient gdata client. And it looks like the old gdata library only works with OAuth 1, which seems deprecated.
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