None.
Currently at the Apple Retail Store, they sell the iPod Touch 8GB which is the 2nd Generation, and iPod Touch 32 GB, and 64 GB which are both 3rd Generation iPod Touches.
The iPod Touch 4th generation and after have cameras. It does not matter the GB capacity.
Yes, the 3rd generation of the iPod Touch has come out with a 16 GB storage capacity.
You can download iMemory Enhancer on your iPod touch.
The most memory that I have heard for a Ipod touch is sixty four gigabytes, which is for the third generation Ipod touch. You can buy them anywhere online.
There is no such thing as an "iPod Touch 3GB". However, There is an "iPhone 3G" or "iPod Touch 3rd Generation". I think you are getting Gigabyte mixed up with 3G network or 3rd Generation. You're looking at around $170-$300.
It depends on the generation. If you seriously want to get an iPod Touch, then I would suggest getting the second generation or later. It is not worth it to buy the first generation at this point in time.
Yes 2nd and 3rd generation ipod touch have speakers build in
No, that generation and hard drive capacity does not have a camera.
The iPod Touch comes with either an 8GB, 32GB or 64GB flash drive. There isn't an 18 gigabyte iPod Touch, nor is there an 18th generation iPod Touch.
The most recent version of the Ipod Touch is the fifth generation Ipod touch. It was released on October 15, 2012 and comes in a variety of colors with either 16 gb, 32 gb, or 64 gb of storage.
No, they are not the same. The 3rd generation 8 gigabyte iPod Touch should have a built-in microphone. The 2nd generation does not have a built-in microphone.