I just find it so amazing that so many of you are so adamantly against a built-in speaker on the iPT. I think you're really missing the point. The intent of adding an internal speaker is NOT to provide high quality sound. I think we can all agree that if you want to hear high quality sound from an iPT, then use earbuds, headphones, or connect it to an external speaker or amp--that seems to be a no-brainer.
But we're not looking for high quality sound here. We just want the ability to simply hear sound without the hassle of headphones or earbuds. Just about EVERY modern (and not-so-modern) PDA has some sort of speaker that is more capable than what's currently included. Why should the iPT be different? I really think it's because of the fact that the iPT has "iPod" in its name, so therefore it MUST immediately get relegated to a "device + earbuds" status.
Really, how many times have you wanted to simply show someone a small video clip or play a sound byte, but you decided against it because you either didn't have, or don't want to hassle with headphones or earbuds? And as applications become available, you can be sure that many will have sound that would be better played with a speaker more capable than what's currently included.
Some of us chose the iPT over the iPhone for cost reasons. (The cost of an iPhone is over 6 times that of an iPT, when considering the required 24-month service plan) yet how much would it cost Apple and the consumer to add a simple internal speaker? And no, it wouldn't be "always on". Obviously, a System Settings would let the user configure it. Come on, let's step out of the restrictive mold of an MP3 or Media player, and have a little vision.
Many users are seeing the iPT not as "just an iPod" but as SO MUCH more. I firmly believe that Apple has a HUGE opportunity to become the PDA/SmartPhone leader, snagging the title from Palm. With AppStore coming soon and the overall amazing design and implementation of the iPhone and iPT, it just seems that omitting something as basic as an internal speaker just because "it's an iPod" is really limiting and short-sighted.