Before extending my Flickr pro account a few weeks ago for another year I was already thinking about how it might be replaced by something else. With the launch of Google+ and it's Picasa web integration it became obvious that Picasa might be this new service for me. So I did some googling today and came up with this nice guide to migrate from Flickr to Picasa without much to do manually. It worked like a charme on my Mac and pulled my 90 sets and thousands of photos from flickr in about 2 hours. I only have to change album dates manually now to make them appear in the correct order. Sets, tags, descriptions and location data are tranfered automatically. 

I'm not sure yet if this will be the final solution but at least it worked quickly and photos are mirrored on another service now.