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Aaron’s FlickrApp is a brain dead easy to use subclass of webapp.RequestHandler that turns Flickr into an single-sign on service for Google AppEngine.

As a bonus, you get a valid Flickr auth_token for every signed in user. This makes writing Flickr API apps about the simplest thing ever.

Case in point, I wrote the largely mis-named photosthatmatter app last night in slightly less then 20 minutes, while waiting for dinner to simmer. Shows the most interesting photo from each for your contact in a given time period. Great for catching up on things you missed as they flowed by the first time.

YMMV, but it works for me.