If you guys are talking about the EXIF/IPTC keywords (See screen shot below) I thought Google has not yet started reading those types of things.
To my knowledge, Google only reads the file names, title and alt tags but I could be wrong. Would be awesome if they do.
....................
....................
Check the last two posts on this thread.
http://www.google.com/support/forum/...e7e62a5d&hl=en
If I am wrong on this please let me know.
Thanks.