A while back Mike mentioned the beta release of the stand-alone Flickr Uploadr and now the Flickr folks have announced the official release. Flickr Uploadr allows you to tag, describe, and organize your photos locally before uploading them to the online photo service. The signature new feature of version 3 allows reordering of your photos before uploading just by dragging them around. Version 3 also lets you work offline, and once you start the actual upload you can start adding and tagging new photos even before the first batch is finished uploading.
Flickr Uploadr version 3.0 is a free download from Flickr.com.