How can I get a list of unique products a Craft Commerce customer has purchased? I'm trying to figure out a way from Twig to get a distinct list of products purchased by a user. Help?
Something like this should work:

{# Grab the currently logged in users past orders %}
{% set pastOrders = craft.commerce.orders.customer(craft.commerce.customer).find() %}

{% set uniqueSKUs = [] %}

{# loop through the orders #}
{% for order in pastOrders %}

    {# loop through the line items #}
    {% for item in order.lineItems %}

        {# did we find a unique one? #}
        {% if item.purchasable.sku not in uniqueSKUs %}

            {# add it to the list #}
            {% set uniqueSKUs = uniqueSKUs|merge([item.purchasable.sku]) %}

        {% endif %}
    {% endfor %}
{% endfor %}

&lt;h1&gt;Unique SKUs for customer ID {{ craft.commerce.customer.id }}:&lt;/h1&gt;

&lt;ul&gt;
    {% for sku in uniqueSKUs %}
        &lt;li&gt;{{ sku }}&lt;/li&gt;
    {% endfor %}
&lt;/ul&gt;