kilogauss [kilogauss]

I am part of the foxycart.com affiliate program. Some of the links to foxcyart.com in this module contain my affiliate id.

Please make this opt-in if it's not already.

I would like to try this module out without having to signup to download FoxyCart. Is that possible?

@kilogauss: I take your affiliate ID is not used from the module anymore.
I am changing the status as per previous comment. Remember to change status when you upload new code.

The module doesn't have the installation file, which should contain at least the implementation of hook_uninstall().

version = "6.x-1.0"
project = "foxycart"

Those lines needs to be removed, as they are added from the packaging script, and having multiple copies of those lines confuses the update script.

  $items['admin/foxycart'] = array(
  	'title' => t('FoxyCart'),
  	'page callback' => 'drupal_get_form', 
  	'access arguments' => array('access administration pages'),
  	'page arguments' => array('foxycart_admin_settings'),
  	'file' => 'foxycart.module');

Menu titles, and descriptions should not be passed to t() as that is already done by Drupal core code.
Replace any character tab with two spaces, that is the indentation character suggested by coding standards.

    switch ($op)
    {
      case 'submit':

The curly bracket needs to be inline with the control operator (switch, while, if, etc).

  header('Location: ' . $full_redirect);

The code should use drupal_set_header().

  $logolink = fclink('<img id="fc_admin_logo" src="' . $base_root. '/' . $path . '/powered-by-foxycart-108x46.png" alt="Powered by FoxyCart Ecommerce" />');

There is a theme function for image tags.

  	'#description' => '<p>' . $logolink . t('Here you can configure all of your'). ' ' .fclink('FoxyCart') . ' ' .  
  t('integration settings.') .'<br/>' . t('If you do not yet have a FoxyCart account,') . ' ' . fclink('Click Here to Sign up.') . ' ' . t('It\'s easy and free to try') .'.</p>' );

Use t()-placeholders instead of concatenating string; in that way who translates the sentence has a context. The sentence should be written in sentence case (This is written in sentence case), and there should not be any quote escaping (use a different string delimiter, if that character is already used inside the string).