There are plenty of ways to get pictures from your Mac up to Flickr; among them the 'official' and free tool, Flickr Uploadr, which is now being revised to version 3. The second beta version of v3 is out for download. This uploader is an open-source project, so anyone interested in the source code can download that along with the compiled app.
New in v3 of the uploader tool is the capability of tagging, sorting and setting permissions on multiple photos prior to the upload to Flickr, along with a preflight resize to reduce data transfer and help keep you under your upload threshold. The beta currently has a menu display problem under Leopard but seems to be otherwise functional and speedy (Christina noted that it's dramatically faster than the web-based upload tool). Get those turkey pictures online!
[via Download Squad]