Here's a look at a consolidated spec view of the new iPods

iPod nano
Now available in silver, purple, blue, green, orange, yellow, pink, (PRODUCT) RED and black.  The cost per Gigabyte (GB) is $18.63 per GB for the 8GB model and $12.44 for the 16GB model.  Previously Apple offered a 4GB model with a $37.25 cost per GB price and a 8GB model with a $24.88 cost per GB price.  The new iPod nano gives users up to 24 hours of music playback or four hours of video playback.

iPod touch
iPod touch is now differentiated from the iPhone thanks to the contoured stainless steel design, integrated volume controls into the side, built-in speaker, and integrated Nike+ software.  The 8GB is available for purchase today and will be joined by the 16GB and 32GB in the next few days.  The new iPod touch features a thin contoured metal design, a 3.5-inch widescreen glass display, 802.11 b/g Wi-Fi wireless networking, integrated volume control buttons, a built-in speaker for casual listening, a built-in accelerometer and other advanced sensors, and Apple's revolutionary Multi-Touch user interface.

We accurately predicted the magnitude of the iPod touch price cuts earlier today.

iPod Classic
The iPod Classic is only available in a 120GB model and replaced the 80GB and 160GB prior generation models.  The cost per Gigabyte (GB) has fallen to just under $2.08 per GB versus $3.11 and $2.18 of the prior generation 80GB and 160GB models respectively.


Here's a look at the old iPod lineup


Note images captures obtained from the online Apple Store for comparative purposes.