Extracting field values (of certain entity type and bundle) from form/form_state
All the field values are in $form_state['values']. See: drupal_form_submit.

You might also be interested in using hook_form_BASE_FORM_ID_alter instead of hook_form_alter to target a particular content type. Your function would look like: 'mymodule_form_' . $form_id . '_alter'.

Or at least an:

if ($form_id == 'your_content_type') { // add new submit handler }


in hook_form_alter.

Also use LANGUAGE_NONE, without quotes, instead of 'und' ie $some-&gt;var[LANGUAGE_NONE]['value'];



Also for future reference: 
Install the Devel module, use dpm($form_state,'$form_state');

When you use dpm you get nice dumps of variables that look like:
http://goo.gl/qIf6p