At the moment, I'm uploading the pictures I took during the journey through Ireland that Carolin, Tom and I went on in 2002. To be exact, jUploadr is doing the upload.
jUploadr is a great tool for annotating, tagging and uploading pictures to Flickr. Since it's written in Java (as you can guess from the initial "j"), it's platform-independent. So it works on Linux and it makes photo sharing on Flickr so much easier: just drag and drop your pictures onto the jUploadr window, type in some headlines, descriptions and tags, and click "Upload!". Easy-peasy.