Well, again, don't quote me on this one. From my experience, the meta tag is just a way to attach some meta information to the document. For example, search engines uses the keywords/contents/etc in the meta tags to index a document. Also, tools such as Microsoft Frontpage uses the meta tag to keep track of its internal feature in a more standardized way. (e.g. using the meta tag to keep track of the borders feature, instead of a more proprietary way, although ironically this also produce the validation warning.)
Meta tags serve all kinds of useful purposes and are becoming more Mandatory as we move away from HTML, to XHTML/XML/CSS etc.
Two tags that serve a good purpose for any site are:
<meta http-equiv="imagetoolbar" content="no">
For people who can't figure how to turn of this "feature" in IE6
<meta name="MSSmartTagsPreventParsing" contents="True"> Note there is no spacing.
Prevents XP and associated XP programs from turning links on your Web into a "Yellow Rash" disease page. Using that as a keyword will provide some interesting articles at your favourite Search Engine, on what this is all about.
• PotentProducts.com - for all your Hosting needs
• Helping people Host, Create and Maintain their Web Site
• ServerAdmin Services also available