Picasa2Flickr - Upload Photos from Picasa to Flickr

One of the most important advantages of Picasa Web Albums compared to Flickr is that it's easy to upload photos and to download photo albums if you use Google's photo organizer, Picasa.

Picasa2Flickr is an open source plugin for Picasa that lets you upload photos to Flickr. You can just select some photos from your albums, click on "Send to Flickr" and a small dialog will let you enter some information about your photos: tags, privacy options, the name of a set.

The plugin uses Flickr's authentication API, so you'll enter your credentials in a browser, without passing them to the application.