Keywords in your Meta tags help for the most part.  Although they used to be very important, they are not only slightly important and many websites forgo them altogether.  However, since they do not hurt, and you never know when they may become important, there is no reason not to have keywords in your Meta Tags.

• Title Tag: Very Important.  Short and sweet.
• Keywords Meta Tag.  10 or so keywords is all you should use.  Best keywords first.
• Meta Descriptions: often used for search engine excerpts.