<% form_for @user do |f| %>
  <!-- Alphabetic order -->
  <%= f.select_sym "so" %>
  <!-- Fixed order -->
  <%= f.select_sym "office" %>
<% end %>

<!-- Alphabetic order -->
<select id="user_so" name="post[so]">
  <option value="linux" selected="selected">Linux</option>
  <option value="mac">Mac OS X</option>
  <option value="windows">Windows XP</option>
</select>
<!-- Fixed order -->
<select id="user_office" name="post[office]">
  <option value="kde" selected="selected">Koffice</option>
  <option value="ms">Microsoft Office</option>
  <option value="open">Open Office</option>
</select>