i would still assume that 800x600 is most common...but it's not always necessary to code 2 separate pages...

what i do is code to 800x600 minimum and then using dynamic tables to fill up the screen for higher rez...


something like


<table width="100%">
<tr><td>
my header which can stretch as far a needed
</td></tr>
<tr><td>
this is a left hand menu which changes widths
</td>
<td>
<table width="585">
<tr><td>
this is my main content which is resticted to a width of 500
</td>
</tr>
</table>
</td>
</tr>
</table>