In reply to elecgraystone (msg # 8):
A full attack however takes a full round action... but as others have mentioned, a full round action does not preclude you from being able to make certain types of other actions.
You can take a 5' step... and they even make it clear that you can choose to take your 5' movement either before, after or even once in between two of your attacks. So if you have several attacks, and use two to down an opponent, and none remain adjacent to you, you can take a 5' step and strike a new opponent. (as long as someone else is within 5'.)
http://paizo.com/prd/combat.html#full-attack-action
There are however also some other clarifications that you can't use a 5' step in between cleave attacks and I believe some other examples, but it is pointed out the extra attacks in those cases are not part of a 'full attack' action. Also if movement difficulty exists due to terrain, you may not be eligible for a 5' step.
Another type of action other than the 5' step, is a swift, or any free actions can be done, even when doing a full round action. Hope that helps you some. (these are 3.x/pathfinder rules... so not relevant to 4e or others necessarily)
Pounce is an action granted by a specific feat, that I believe allows you to use TWF at the end of a charge. As a charge involves movement, you wouldn't be able to do a 5' step in between strikes, since a charge is not a full attack action, it is a charge action (which is normally another full round action which involves making an attack).