Powerful is the plugin that makes me wait until it is ready before I upgrade to Apple's latest and greatest. Connected Flow's FlickrExport is one such plugin. It makes uploading photos from iPhoto to Flickr, Yahoo!'s photo sharing site, a breeze. Tag pics, upload them, add them to groups, create albums; it does it all.
Luckily, it was recently updated to address an with iPhoto '08, that issue being it wouldn't work with the latest version of iPhoto. FlickrExport 2.0.12 adds only one thing to this indispensable plugin: iPhoto '08 compatibility. This update is free for registered users, while a full license costs £12.