Moving a site to a different domain

Sometimes you need to move a site from one domain to another.
Happens mostly when beta testing on a temporary subdomain, and one day, you wanna move, but what will happen to all the incoming links?
There is one method for a TEMPORARY domain change [302] (for maintenance or something similar) , and there is one for a PERMANENT domain change [301].

Two good methods, via .htaccess via PHP or via HTML:

The htaccess redirection method:

redirect 301 / http://newDomain.com

For a PERMANENT redirect, or

redirect 302 / http://newDomain.com

For a TEMPORARY redirect.

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The PHP redirection methods:

header('HTTP/1.1 301 Moved Permanently', true);
header('Location: http://newDomain.com/');

For a PERMANENT redirect, or

header('Location: http://newDomain.com/');

For a TEMPORARY redirect.

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The HTML redirection method:

<meta http-equiv=refresh content="0; url=http://newDomain.com" />

NOTE: The 0 (Zero) can be changed to a number of seconds you'd like the browser to wait before redirecting. Usually used to display a "We have moved" notice.
NOTE2: When using 0 (zero) as the timeout param, Google/Yahoo will treat it as a 301 PERMANENT move, while when using a higher timeout duration they will treat it as a 301 TEMPORARY move.