From codex:
$meta_value (mixed) (required) The
value of the custom field you will
add. An array will be serialized into
a string. Default: None
So <?php add_post_meta(7, 'fruit', 'banana', 'apple', 'tornado', 'bob saget')
To grab them you can also use http://codex.wordpress.org/Function_Reference/get_post_custom_values
besides just get_post_meta.
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