public function findTagWeights($limit=20)
	{
		$models=$this->findAll(array(
			'order'=>'frequency DESC',
			'limit'=>$limit,
		));

		$total=0;
		foreach($models as $model)
			$total+=$model->frequency;

		$tags=array();
		if($total>0)
		{
			foreach($models as $model)
				$tags[$model->name]=8+(int)(16*$model->frequency/($total+10));
			ksort($tags);
		}
		return $tags;
	}