How many generations of Ipod touch are currently available?

I am new to the ipod touch market and while researching on the web cannot figure out if there is a first and second generation or only a first. I am not talking about the regular ipod, but rather the ipod touch. I am debating on waiting for the next generation of the touch, because i can wait and I would think there would be significant improvements. Any meaningful thoughts is much appreciated.

not a new generation. it came out in like september but then in january they came out with the 32gb iPod touch. it's the same thing though

there is only a 1st generation ipod touch but in january apple released the 32GB model above the 8gb and the 16gb models. So far apple has not yet announced a 2nd generation ipod touch.

one....

there i only one ipod touch out. there have been a lot of software upgrades like currently there is the 2.0 software upgrade. there also is the app store for the ipod touch. there is no new ipod touch model out yet. i want to get an ipod touch too and i am going to wait at least till September because the ipod touch has been out for almost a year now(which is a really long time for apple) and apple usually updates the entire ipod line up in September because it is right before the holiday season. hope i helped