I burned a DL disk with my Nec 2500a flashed to 2510a, firmware Maddog 2.F7, booktype to DVD-ROM. Very good burn, im suprised with the burn quality. I got ( well, an offert from my boss 
) a Verbatim DL DVD+R 2.4x, reads without problems on my Liteon DVD-ROM. This weekend i will try it on a Playstation 2 and a stand alone player. Here’s the scan:
looks good! 
Thanx for the scan FearFactory i’ll have to remember to flash to 2.F7 when i try DL media (Verbatim). Price has to come down some for me to buy it.
Yeah, seriously, I can’t believe the damn disks are still $10/piece!
Yeah, this media seems very good but the price is high too… like i said, i got this DL disc for free, a gift from my boss
Well, the price must come down eventually. By then, we are all burning DL DVD’s 
At this link: http://www.ar-it-services.de/shopneu/catalog/index.php?cPath=40&osCsid=2c563e74c9491a1fb8071c8dbf7ffb64 you can buy Verbatim DVD+R DL for 7 Euro (German site).
I tried the disc on a stand alone player, works great. But on a PS2, it stops in the menu. Next move, Xbox.