You have an extra 8px after the #form2 in IE7 also, I haven't looked into that yet.
You have the same thing going on after the floated <ul class="tools left"> in the form table. You will have to use a hard clearing div in the html since you have no other elements to hook clear:both; to.
Code:
</tbody>
</table>
<ul class="tools left">
<li class="left first"><input name="btnToggle" id="btnToggle" value="Attiva/Disattiva selezionati" class="button" type="button"></li>
<li class="left"><input name="btnDelete" id="btnDelete" value="Elimina selezionati" class="button" type="button"></li>
<li class="right"><span class="spaced">Pagine:</span>
<ul class="pagination">
<li><strong>1</strong></li>
</ul>
</li>
</ul>
<div style="width:100%;font-size:0;clear:both"></div>
</form>
</div>
</div>
<!-- InstanceEndEditable --></div>
</div>
<hr class="print">
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