Here's a quick example that illustrates how to remove a few State/Province options from the billing and shipping panes of the Ubercart checkout form, as well as the order edit/create form. Please understand there are other ways to do this (like altering the united_states_840_1.cif file and re-importing). The ​hook_form_alter() method seems less permanent, so I favor it.

I've been working on a multilingual site that has a product finder. We have 3 exposed filters that allow a user to select an Activity, IP Category, or Industry. All of these filters are Taxonomy Term filters. Some of the terms throughout those vocabularies have a specific language set, and should only show when that language is active.

The first step is to make sure the output (Views results) only shows products where the node language matches the current language. This is easy using the built in Node translation: Language = Current user's language filter.

Webform is an amazing module. Thankfully, you can extend it to make it even more helpful. We've had a lot of clients that offer a "Join Our Mailing List" type of functionality on their sites. These forms are typically one or two fields (email and name, usually) and are for anonymous users. We use Campaign Monitor for most clients.

There is a Campaign Monitor module, but I prefer the following method, for various reasons.

After the break, I'll show you how to move a field into a different fieldset within a form using hook_form_alter() and a special #after_build form property.

The following examples shows how to hide fields/fieldsets in forms using hook_form_alter(). I suggest using the devel module to determine how to target your field(s) or fieldset(s). You can add a dpm($form) to the function during development and testing.