Lets look at Chill Touch as an example. Its description states that it can be applied once per caster level among one or more creatures. Therefore, as a 5th level sorcerer, I can use Chill Touch 5 times per cast, spread among up to 5 creatures. Under Combat->Cast a Spell->Touch Spells in Combat-> Holding a Charge:
Holding the Charge: If you don’t discharge the spell in the round when you cast the spell, you can hold the charge indefinitely. You can continue to make touch attacks round after round. If you touch anything or anyone while holding a charge, even unintentionally, the spell discharges. If you cast another spell, the touch spell dissipates. You can touch one friend as a standard action or up to six friends as a full-round action. Alternatively, you may make a normal unarmed attack (or an attack with a natural weapon) while holding a charge. In this case, you aren’t considered armed and you provoke attacks of opportunity as normal for the attack. If your unarmed attack or natural weapon attack normally doesn’t provoke attacks of opportunity, neither does this attack. If the attack hits, you deal normal damage for your unarmed attack or natural weapon and the spell discharges. If the attack misses, you are still holding the charge.
This implies to me that I could hold 5 Chill Touch charges that I can use on enemies across 5 melee touch attacks, which would take multiple rounds. However, under Magic->Spell Description->Duration->Touch Spells and Holding the Charge:
Some touch spells allow you to touch multiple targets as part of the spell. You can’t hold the charge of such a spell; you must touch all targets of the spell in the same round that you finish casting the spell.
This doesn't make any sense to me. As described in the first quote, a touch attack can only be applied to an enemy by performing a melee touch attack. You would have to be a really high level sorcerer to be able to make even more than one attack per round. It would make a spell like Chill Touch utterly useless in the face of other damage-dealing alternatives like Burning Hands or Shocking Grasp. It would only make sense if you could cast it once, and use it across multiple rounds, perhaps in conjunction with a melee attack with a weapon.
How do touch attacks with multiple targets normally work?