Benefits: Dual Layer Burners

Can someone tell me the benefits of the newer dual layer burners. From what I know, they hold more hours and they burn faster. Can movies fit into a single dvd disc or do they usually need more than just 1 disc. Also, whats the difference between the DVD-RW and DVD+RW. I'm not sure but from what I was reading the DVD+RW is dual layer. Does dual layer mean you can write on both sizes of the disc. Can you fit two movies on it?

 

Here is a good article that will answer your questions

http://www.dvdplusvideo.com/dvd_tech.html

 

"benefits of the newer dual layer burners"

... EVENTUALLY, dual-layer media will get cheaper. For the time being I'm perfectly happy with burning single layers and waiting for the whole HDTV vs. Blu-Ray debate to be settled before I buy my next burner.