List all content of the same Author
Are you using 6 or 7? In 6 you'll need to add an Argument; in 7 a contextual filter. Either way, it works pretty much the same. 


Create a block display.  
Add the fields you want (usually just the title for a simple list.)  
Add either an argument or contextual filter for the author uid.


Then under "Action to take if argument is not present", choose provide default value. For the default value, choose PHP Code, and add this code to the box:

if (arg(0) == 'node' &amp;&amp; is_numeric(arg(1))) {
    $node = node_load(arg(1));
    $uid = $node-&gt;uid;
}
return $uid;


Save your view; then clear all caches.

Note that the use of contextual filters renders the preview unusable; you'll need to actually add your block to a page to see it.