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var currentTallest = 0,
     currentRowStart = 0,
     rowDivs = new Array(),
     $el,
     topPosition = 0;

 $('.blocks').each(function() {

   $el = $(this);
   topPosition = $el.position().top;
   
   if (currentRowStart != topPosition) {

     // we just came to a new row.  Set all the heights on the completed row
     for (currentDiv = 0 ; currentDiv < rowDivs.length ; currentDiv++) {
       rowDivs[currentDiv].height(currentTallest);
     }

     // set the variables for the new row
     rowDivs.length = 0; // empty the array
     currentRowStart = topPosition;
     currentTallest = $el.height();
     rowDivs.push($el);

   } else {

     // another div on the current row.  Add it to the list and check if it's taller
     rowDivs.push($el);
     currentTallest = (currentTallest < $el.height()) ? ($el.height()) : (currentTallest);

  }
   
  // do the last row
   for (currentDiv = 0 ; currentDiv < rowDivs.length ; currentDiv++) {
     rowDivs[currentDiv].height(currentTallest);
   }
   
 });​