From
Matt Cutts blog referenced by Natural Elements:
Quote:
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...Suppose you want your default url to be http://www.example.com/ . You can make your webserver so that if someone requests http://example.com/, it does a 301 (permanent) redirect to http://www.example.com/ . That helps Google know which url you prefer to be canonical. Adding a 301 redirect can be an especially good idea if your site changes often (e.g. dynamic content, a blog, etc.).
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If you are using an Apache server you do this in your .htaccess file:
The technical explaination at Apache - mod_alias - Apache HTTP Server -
Redirect Directive
A tutorial how to create a 301 permanent redirect in the .htaccess file -
Basic 301 Permanent Redirect