Use pinnacle 12 to convert your vobs into Mpeg 2 files with a resoulution of 1920x1080.
Cut the new mpeg files to a maximum size of 1 gig(youtube file limit), and upload 1 at a time to youtube, naming them part1, part 2 etc.
This will create hd youtube files.
It will take a fair amount of time to upload each file, but quality wise it's worth it. When the file uploads
to youtube it can look poor quality wise.
After about 30 minutes it changes from a normal looking video to a hd one.
If you want to upload in regular quality you could just convert to avi or any type of mpeg, and leave
youtube decide the quality for you.
Remember to give the video time to appear on youtube when the upload finishes.