I have found something that does not appear to be working correctly.
From the Add Form Dialog, I select Registration for the type of form,
then I select Sharp for the Design.
Click edit for the design.
Select Fieldset from select box.
Select Fieldset Description from the select box that appears under that one.
The alignment field says left, but no matter what you do with that setting, the description text is always aligned right.
This is seen in both the preview, and I have seen it in FF 3.5.