I've been keeping a close eye on the world of Search Engine Optimization for several years now. In fact, one reason this blog came to be was so I could use trial and error to see what worked for the bots. Over the past few years, one thing became abundantly true with regards to the biggest search engine of them all, Google.
Google doesn't care about your "keywords" meta tag. I can't tell you how many arguments I've had with people over this one fact. Earlier today, Google made it very clear.
Q: Why doesn't Google use the keywords meta tag?
A: About a decade ago, search engines judged pages only on the content of web pages, not any so-called "off-page" factors such as the links pointing to a web page. In those days, keyword meta tags quickly became an area where someone could stuff often-irrelevant keywords without typical visitors ever seeing those keywords. Because the keywords meta tag was so often abused, many years ago Google began disregarding the keywords meta tag.
It's all explained in this video. In a nutshell, you're wasting time stuffing keywords in your meta data. It's all about creating content and putting the content in the right places. And that's one to grow on.