EDITCANDY  I love Keyword Assistant but it's in need of at least a small update. I do feel for the Intel Mac crowd out there. But even for us dark ages PPC people, we've seen two iPhoto updates and nary an update for KA (note to Ken Ferry, please don't abandon us). I was sick of not having the full KA feature set so I decided to hack around and I figured out how to very simply turn the features back on. Can't promise you it's a good idea but if you're a little adventurous, here's how:

Quit iPhoto -- Find your iPhoto application -- Control-click and choose Show Package Contents -- Drill through the following directories: Contents:NetServices:Bundles:KeywordAssistant.NetService:Contents:MacOS

Open KeywordAssistant in your favorite text editor (I like Smultron). Search for the phrase: "WarnForiPhotoVersionsAbove" and change the version number that immediately follows to something that corresponds to your current version of iPhoto -- Good luck.  
(Version 1.9.1)