I looked quickly and did not see any code out there to determine the nth occurrence of a specific day of the week in a month. For example Thanksgiving is the 4th Thursday in November. So I designed the following
<?php
$year = 2012;
//Pick your year
$interval = 4;
//Week number, in this case the 4th week
$dayofweek = 4;
//Day of week 0=Sun, 1=Mon. . .
$month = 11;
//Month 1=Jan, 2=Feb
$firstday = jddayofweek(gregoriantojd($month, 1, $year), 0);
if($firstday <= $dayofweek){
$date = (($interval * 7)-6) + ($dayofweek - $firstday);
}else{
$date = (($interval * 7)-1) + (6 - $firstday);
}
echo date("n/j/Y", mktime(0, 0, 0, $month, $date, $year));
?>
It looks a little messy, but it works perfectly.
UPDATE:
So apparently as bad as this looks it works too:
I have noticed a bug in javax.microedition.pim.RepeatRule, when I tried to set a an event to repeat every second sunday of may I would get an event that repeated every second sunday of april. I determined that this was being caused by MONTH_OF_YEAR being deincremented by 1 month after the event was committed. 
TiVo Central Online is pretty cool, it allows you to program your TiVo to record an upcoming show or season pass from the interent. I wanted to be able to access TiVo Central anywhere I went, unfortunately TiVo Central is not available for Mobile devices. So I decided to whip up a quick PHP script to parse TCO and repaginate it into a mobile friendly html site. This is all accomplished in 480 lines of php code. The script allows for searching of upcoming shows by title, description, or cast members. After searching you can select the specific showing and record it using a one time or season pass recording. Additionally the script allows access to all advanced recording options and will send you an email to confirm the recording. 
I have always been a fan of the Gallery program. You can see my pictures 
I want to have plants on my balcony, but I knew I would be incapable of watering the plants everyday. Clearly I needed an automatic watering system, however, I live on the 5th floor and have no access to water on my patio.