socialforge/app/views/issues/_form_custom_fields.html.erb

<div class="splitcontent">
  <div class="splitcontentleft">
    <% i = 0 %>
    <% split_on = (@issue.custom_field_values.size / 2.0).ceil - 1 %>
    <% @issue.editable_custom_field_values.each do |value| %>
        <p><%= custom_field_tag_with_label :issue, value, :required => @issue.required_attribute?(value.custom_field_id) %></p>
        <% if i == split_on -%>
            </div><div class="splitcontentright">
        <% end -%>
        <% i += 1 -%>
    <% end -%>
  </div>
</div>