Different search engines might use different meta tags, giving more or less importance to different ones.
Here's the meta tags I use on my page:
<
meta HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
<
meta NAME="language" content="en-us">
<
meta NAME="Keywords" CONTENT="3-D, 3D, graphics, images, rendering, inside the OuTpaTienT mind..., POV-Ray, Persistance of Vision, raytracing, 3DS, computer graphics, Simon the kick ass cat, poems, original art, tenacious d">
<
meta NAME="Description" CONTENT="inside the OuTpaTienT mind..., original 3D raytracing art, Tenacious D, misc links, and Simon the kick ass cat.">
<
meta NAME="Author" CONTENT="OuTpaTienT">
<
meta NAME="distribution" CONTENT="Global">
<
meta NAME="revisit-after" content="5 days">
<
meta NAME="robots" content="index,follow">
<
meta NAME="rating" content="general">
There are some strict rules as to limit of characters and how to use some of the words in conjunction with text on your page if you want to get the best results from the search engines.
Meta Tags HTML META, REL and REV Tags AnyBrowser.com - META Tag Overview Free META Tag Analyzer and META Tag Help How To Use HTML Meta Tags Magic with Meta Tags