I think it does (work on DVDs), but I'm not sure. I never went to 6. I think the general impression is that 7 is a much better product overall than 6 was (although many people just hate Roxio on principle
) -- but I think they did a lot of work to make EMC 7 more compatible and better code. (there were lots of growing pains with 6; if you happen to get it be sure to immediately patch it right up to the latest version!)
Of course, I barely ever use it for anything but I do use Drag-2-Disc quite a bit.
I would say that unless money is a really overriding concern, keep an eye out for a big rebate on Easy Media Creator 7 and get that version so you're not buying software that's already obsolete. You may be able to get EMC7 for $29.99 or $39.99 after rebate if you keep an eye out and don't need it immediately.