High-quality keywording photos is a time-consuming, but essential task for ensuring success in stock photography.

I have earlier announced EasyTag, which is the predecessor of Mykeyworder for Lightroom. Sam and I have joined forces and developed Mykeyworder for Lightroom to take the pain out of keywording.

The plugin allows you to add keywords from the following sources:
 - http://www.mykeyworder.com - search for related keywords from 1-3 starting keywords.
 - Auto-identified from image contents.
 - Title and caption, which you need to enter anyway.
 - Manually entered keywords.
 - Synonyms from any of the above.

Mykeyworder for Lightroom supports both single-image and batch processing of multiple related images.

The basic version is free, but you'll need to make a donation of at least 10 USD (in the plugin) to unlock its full functionality.

http://www.mykeyworder.com/lightroom

Hope you'll like it and comments or suggestions for improvement are most welcome!