Someone

function blog_block($op = 'list', $delta = 0) {
  global $user;
  if ($op == 'list') {
    $block[0]['info'] = t('Recent blog posts');
    $block[1]['info'] = t('MyExchange Blog');
    return $block;
  }
  else if ($op == 'view') {
    if (user_access('access content')) {
      
      $blog_sql = "SELECT n.nid, n.title, n.created, n.uid " .
      		      "FROM {node} n " .
      		      "WHERE n.type = 'blog' " .
      		      "AND n.status = 1 ";
      
      // a bit of a hack right here.. no point in duplicating code though..
      if($delta == '0') {
      	$header = t('Recent blog posts');
      	
      } else if ($delta == '1') {
      	$header = t('MyBlog');
      	
      	// get the user selected from the URI.
      	if(is_numeric(arg(1))) {
      	  $user_details = user_load(array('uid' => arg(1)));

		  // user exist?      		
      	  if($user_details === FALSE) {
      		// make it return nothing if the user_id requested doesnt exist
      	    return FALSE; 
      	  } else {
      	    // otherwise we need to get the last 10 posts for the user
      		$blog_sql .= "AND n.uid=%s ";
      	  }
      	}
      }
    
      $blog_sql .= "ORDER BY n.created DESC";

      print"<pre>";
	  print $blog_sql;
	  print"</pre>";
	  
	  // i'd kill for some real data objects so I didnt have to do this:
      if(isset($user_details->uid)) {
        $result = db_query_range(db_rewrite_sql($blog_sql), 0, 10, $user_details->uid);
      } else {
      	$result = db_query_range(db_rewrite_sql($blog_sql), 0, 10);
      }
      // well, it'll work i guess.
      
      if (db_num_rows($result)) {
        $block['content'] = node_title_list($result);
      } else {
      	$block['content'] = t("This user has not posted any blog entries.");
      }
      
      $block['content'] = 'nothing';
      $block['content'] .= '<div class="more-link">'. l(t('more'), 'blog', array('title' => t('Read the latest blog entries.'))) .'</div>';
      $block['subject'] = $header;
      
      return $block;
      
    }
  }
}