The new Flickr Uploadr has been built from scratch to work on Windows and Mac OSX. Before you upload you can add titles, tags and descriptions, add stuff to sets and reorder things directly in the Uploadr. This is an open source project, too, so you can download it and have a look at how it works.
Commercial Use
Modify
Distribute
Place Warranty
Sub-License
Hold Liable
Distribute Original
Disclose Source
Include Copyright
State Changes
Include License
These details are provided for information only. No information here is legal advice and should not be used as such.