iPod Touch as a PDA?

Right now, I am looking for an organizational tool, and having a really good phone that I got for my birthday from my dad, i didn't want a PDA phone.

I decided to look for a PDA, and i found PDAs like the HP iPAQ rx1950, Dell Axim 51, Palm Tungsten E2, Palm Z22, and the Palm TX. from searching around, and asking around I concluded that the Palm TX is the PDA of choice.

Now, since the iPod touch came out, i was wondering if it's good for PDA functionality like PDF reading, tasks, scheduling, etc.