To exclude your site from all web crawlers use: 
User-agent: *   # directed to all robots
Disallow: /cgi-bin/sources

To exclude your site AltaVista's web page index:
User-agent: scooter   # AltaVista web page search
Disallow: /cafeteria/lunch_menus/

To exclude your site AltaVista's image, video and audio clip index: 
User-agent: vscooter   # AltaVista Image Search
Disallow: /personal/images/

<META name="robots" content="noindex, nofollow">
AltaVista's crawler currently recognizes four (4) META tag exclusion options:

NOINDEX prevents anything on the page from being indexed. 
NOFOLLOW prevents the crawler from following the links on the page and indexing the linked pages. 
NOIMAGEINDEX prevents the images on the page from being indexed but the text on the page can still be indexed. 
NOIMAGECLICK prevents the use of links directly to the images, instead there will only be a link to the page. Currently, AltaVista will only link to the page. 

http://info.webcrawler.com/mak/projects/robots/robots.html

<META name="description" content="Everything you wanted to know about stamps, from prices to history.">
<META name="keywords" content="stamps, stamp collecting, stamp history, prices, stamps for sale">