ForexFeed [forexfeed]

  '#title'         => l('ForexFeed.net', 'http://forexfeed.net', array('attributes'=>array('target'=>'_blank')) ) .' '. t('Access Key'),

I am not sure you can use HTML tags for the title of a textfield; it seems more appropriate to add a link in the description for the form field (or in the help for the page).

/**  ForexFeed.net Access Key  */
function _forex_feed_get_access_key(){
  return variable_get('forex_feed_access_key', '');
}

/**  Number of available Blocks  */
function _forex_feed_get_num_blocks(){
  return variable_get('forex_feed_num_blocks', 1);
}

It would be better to use directly variable_get().