you should really try and indent your code before you post it, reading long code is just tedious when it's all flat at the back as so.
anyway try
HTML Code:
<td valign="top">
<if condition="!$post['field1']">
<table cellpadding="1" cellspacing="0" width="300" align="center" valign="top" border="0" bgcolor="#ffffff" valign="top">
<td width="100%"><font color="#023E7B" style="font-weight:bold; font-size:10pt; font-family:tahoma, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif;">
About Me: </font>
<br>
<font color="#000000" style="font-weight:none; font-size:9pt; font-family: verdana;"> $post[field1]</font>
</td>
</table>
<br>
</if>
<if condition="!$post['field28']">
<table cellpadding="1" cellspacing="0" width="300" align="center" valign="top" border="0" bgcolor="#ffffff" valign="top">
<td width="100%"><font color="#023E7B" style="font-weight:bold; font-size:10pt; font-family:tahoma, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif;">
About Me: </font>
<br>
<font color="#000000" style="font-weight:none; font-size:9pt; font-family: verdana;"> $post[field28]</font>
</td>
</table>
<br>
</if>
<!-- Start vBBuddies -->
<table cellpadding="1" cellspacing="0" width="300" align="center" valign="top" border="0" bgcolor="#6699CC" valign="top">
<tr>
<td width="100%"><font color="#023E7B" style="font-weight:bold; font-size:10pt; font-family:tahoma, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif;">$vbphrase[buddies]</td>
</tr>
</table>
<table cellpadding="1" cellspacing="0" width="300" align="center" valign="top" border="0" bgcolor="#ffffff" valign="top">
$profilebuddylist
</table>
<table cellpadding="1" cellspacing="0" width="300" align="center" valign="top" border="0" bgcolor="#ffffff" valign="top">
<tr>
<td align="right"><font style="font-weight:bold; font-size:8pt; font-family:tahoma, geneva, lucida, 'lucida grande', arial, helvetica, sans-serif;"><a href="buddies.php?u=$userinfo[userid]" class="onwhite">View All of $userinfo[username]'s Friends</a></td>
</tr>
</table>
<!-- End vBBuddies -->
you also might consider
HTML Code:
<if condition="!$post['field1']">
<!-- do field 1 stuff -->
</else>
<if condition="!$post['field28']">
<!-- do field28 stuff -->
</if>
</if>