Keyword Assistant is an iPhoto plugin that makes keyword management quicker and easier.
It adds a panel with an auto-completing text field for entering keywords. This makes it realistic to keep and assign large numbers of keywords, for example one for every person in a photograph. That's a good thing because it makes searching for a photograph pretty easy. Other niceties include the ability to alphabetize the Keywords list.
Keyword Assistant is currently localized for English, Danish, Dutch, French, German, Italian, Spanish, Swedish and Russian.
WHAT'S NEW
Version 1.9.4: Updated for iPhoto 6.0.6.