Last week we mentioned keyword research again, and currently during our Holiday 2010 Run-Up (http://www.jwag.biz/runup) we are posting a full list of the standard keywords you should be using. It took 2 years of research data for us to easily make up that list.
If you don't have our handy dandy list, you'd have to wait a few months to watch organic traffic to your site to generate the same list.
To speed up your keyword research, and also take all the guess work out of the way, then you need to have paid online advertising through some PPC system.
With Google AdWords, you could create several dozen ads to quickly test specific keywords. You can easily identify useless keyword phrases before you spend time and money on SEO keywords that are nothing more than epic failures.