One thing that you have to note is that Safari on your iPod Touch is more responsive to the unique nature of the technology that you would expect. One of the standards, as you may know, is that you can zoom in or out by using two fingers and either stretching or shrinking the image.
An easier way to zoom in is to just double tap on what you want to go into. This will zoom in quickly and deeply, giving you an intense zoom. If you are looking toward the bottom of a long internet page and want to go back up to the address bar you can do this by just hitting the clock and battery image in the upper right hand corner.