Yes they are and again depending on the size you get different sizes eg

Single layer Blu-ray = 25GB
Dual layer Blu -ray  = 50GB

I do not think the PS3 is a Dual Layer reader anyway...  They're already on the four and six layer process....

Craig wrote:

I dident mean it like a dual layer i just ment like a double layer

Well, dual layer and double Layer is actually the same thing...  When you see "DL+R" people say double layer, or dual layer disc, and not the FLIP over and write, which is known as "double sided" disc.   Dual and Double layer mean the same thing.

Yeah, I been reading, and maybe the PS3 does support dual layer BR-D, but that's 9 hours of HD video. Right now, no movie is that long, and no game is that big, so there is no need for DL yet. 

There are no games, or movies as of now, on Dual Layer BR-discs.  However, If PS3 games are on dual layer?  Then they are using the 2nd layer (like XB360 does with DVD) to store the TOC, so that copying it between two PC BR-D drives is out of the question.  It makes the disc unrecognizable by conventional BR-D drives when they do that.  Once someone gets a PC BR-D and can use a program to read the physical format information of a PS3 game disc, then we'll know if they are dual layer or not, and then know why.

BLOODY HELL
a 45gb movie, btw how did u dump it, u gt a b/d drive??

Yeah as beaker said its done through an other os called SAK and beaker mabey i dont know yet because i have not had much chance to play around with it