Find Drupal Web-Form ID
Find Your Drupal Webform ID
If you need to find the ID for a given Drupal webform, you just need to look in the code. So if you're in Firefox you can use the cool keyboard shortcut (command + u), or in chrome just right click and view page source to see the html markup.
When viewing the page source code, do a find (command + f) for "form_id", this will show you a hidden field in your Drupal form that has an id and a value. The value is what you're looking for, that's the actual id of the form!
Really helpful for use with modules such as Captcha and reCaptcha for Drupal 6.