Is the Macbooks Superdrive Dual Layer????

No. It can read dual layer disk but not write to them

The drives on the new 17 inch Macbooks is dual layered.

The drives on the new 17 inch Macbooks is dual
layered.

That is incorrect.

Here is the information directly from Apple's site:

Slot-loading SuperDrive with double-layer read support (DVD+R DL/DVD±RW/CD-RW): writes DVD-R and DVD+R discs at up to 4x speed, writes DVD-RW and DVD+RW discs at up to 4x speed, reads DVDs at up to 8x speed, writes CD-R discs at up to 24x speed, writes CD-RW discs at up to 10x speed, reads CDs at up to 24x speed

Notice it says "with double-layer read support". That means Read Only.

It does not write to DL disks. The formats it supports writing to are only the standard R/RW no DL is listed.

The 17" CAN burn dual layer:

Taken from:
http://www.apple.com/macbookpro/specs.html

Maximum write: 8x DVD-R and DVD+R; 4x DVD-RW and DVD+RW; 2.4 DVD+R (double layer), 24x CD-R; 16x CD-RW

Yes, the 17-inch does have a Dual Layer. But, the 17-inch is a MacBook Pro.

The MacBook does not have a Dual-Layer.

Of course, now that Apple has given the products similar names, people are going to be arguing about products and not realize that they are talking about 2 different products 😉

No, it haven't. Dual Layer Recorder doen't fit in the Macbook.

If you want to write DL disck you must use an external DVD DL writer.

I've had a DL DVD burner in my PC for 12 months and I haven't burnt a DL disc once

I've had my iMac for almost 9 months, and have only burned one dual-layer DVD. I could have just as easily used Toast to span the data onto two discs since the D\L discs are still kind of expensive, but I wanted to "try" it at least once.

that is a huge disappointment, i would imagine since this is a new computer that it will handle most standards.

even if dual layer disks costs 5 dollars a pop it still should burn to it

DVD+R DL discs are around $2 ea these days in packs.

The reason given back when the 15" MacBook Pro was released was that the system is so thin that there are simply no slot loading Double Layer DVD-R drives that thin right now.

If it was Dual Layer I would have one by now.
I burn DL Discs on my iMac just about every other day. I would love to be able to do that while I am out on the road with my laptop.

I bet it comes out in the next MacBook release. Apple always holds back and adds more to the systems once the early adapters are done with thier buying frenzy.

Funny, Sony has laptops that are 0.83" deep, and they have DL burners:
http://www.sonystyle.com/is-bin/INTERSHOP.enfinity/eCS/Store/en/-/USD/BBBrowseCatalog-Start?CategoryName=hid_txspecs

The Macbook is 1.08" thick see:
http://www.apple.com/macbook/specs.html

So, how can it be "too thin"?

Also Sony has laptops now with blueray burners, crazy, huh?

The reason given back when the 15" MacBook Pro was
released was that the system is so thin that there
are simply no slot loading Double Layer DVD-R drives
that thin right now.

Aren't most DVD movies Dual Layer? Aren't ALL DVD-ROMs Dual Layer READERS? Why even specify that this is a Dual Layer SuperDrive, if ALL DVD drives are Dual Layer?

The distinction being discussed here refers to the ability to burn, not read, so while yes, most DVD Videos are dual layer, not all media that can be burned, or all burners are. They all can read dual layer, but not burn to it.

I believe the size issue comes from the fact that the thinner drives take up more depth/width than the thicker drives. That is why only the 17" MBP has one, it has more extra space below the keyboard due to the extra largeness of the screen being matched by the body of the computer. Thus currently the 15" MBP and the MB line do not have that option.