Personally I would select the 4-5 keywords that best describe the website, products or business and just stick with those. I don't think inserting a whole bunch of keywords is going to be beneficial, and honestly, the keywords probably don't matter at all. However, I understand that some directories will make keywords a required field so you may have to put something there. I would proceed with caution and just approach it with a "less is more" attitude.
Also, another word about directories, make sure you research them very carefully before you decide to submit. Answer these questions:
How long has the directory existed?
What is the directory's Alexa ranking?
What is its PageRank?
How many inbound links does the directory have?
How many of those inbound links are .edu and .gov links?
Is the directory even in Google's index any more?
Does the directory have real human editors? [try emailing them to see if you get a human answer0
Does the directory just include every site that pays them? If so, reconsider your submission.
Does the directory properly categorize the sites it lists?
If you answer those questions about each one, you'll get a better idea if a particular directory is worth pursuing or not. Also, make sure that this is part of a much larger, broader link-earning strategy.
Dana
