Not as important as they once were due to abuse. But still used by a number of well known search engines. But not at all by others. Which means its still important to use them to cover all your bases.
Essentially the meta tags you should be using when targeting the search engines are keywords, description and robots. There are a number of others I'll touch on in a second.
Keywords should also contain keyphrases and list all the keywords/keyphrases relevant to your site. There are two ways to list your keywords/keyphrases. Either with commas separating them or without. The benefit to not using commas is that the keywords side by side can also be read as keyphrases by the SE's. Where as a comma separates everything out. So not using commas allows for some odd combinations to be picked up by the SE's.
meta name="keywords" content=" best exercise equipment cheap home gym equipment health good exercise order online"
That's just an example off the top of my head I haven't researched the words as I normally would, you should also have much more in there around 30 words at least. Notice again I've started of with 'best exercise equipment' to echo and boost the use of that phrase elsewhere as
discussed above.
The description is self explanatory again and it's a good move to echo the title of the page and fill it out a little so -
meta name="description" content="best exercise equipment - best, cheap, new and used exercise equipment reviewed and available to order online"
The robots tag is very simple and is not strictly necessary but useful. What it does is tell the visiting SE spiders what to do when it comes to listing your site. Spiders are the little programs that crawl the web gathering info on websites for the SE's. You can also use something called a robots.txt file to further control the spiders, but I won't go into that here since its not strictly necessary and the robots tag is enough for our aims at the moment.
Here's an example -
meta name="robots" content ="index, follow"
With this we're telling the spider/robot to follow all the links when visiting this page.
If you have a members area or an admin area on your site that you don't want listed in the SE's, or any other pages you want to keep to yourself then you can use this -
meta name="robots" content ="index,no follow"
Other tags that may or may not be useful included from this page -
meta name="author" content="how to make money online"
meta http-equiv="expires" content="0"
meta name="resource-type" content="document"
meta name="distribution" content="global"
meta name="revisit-after" content="1 days"
meta name="rating" content="general"
meta name="generator" content="php-nuke 6.8 - copyright 2003 by
meta name="copyright" content="copyright (c) 2003 by http://how to make money online"
In general I wouldn't use any of the above tags other than author and maybe revisit-after. Since using them will push the text content of your page further from the top of your document.
A well known and very useful tool for checking out what search words people are using on the SE's is Wordtracker. When you know what people are searching for you know what keywords and keyphrases you should be weaving into your website.
This tool is used by all the online Marketing experts. Another tool is the a Overture suggestion tool which will list the number of times a word or phrase has been searched for on the Overture engine over the previous month. A handy tool that will query Overture directly from your desktop and store all results of your keyword searches is Good Keywords.
For a more extensive list of keyword resources try my a keyword research page.