neo's right rapidshare has a size limit, yousendit does not. Not only that, but you can only download 30mb or so from rapidshare in a single hour.
So if I want to upload 100mb of smaller videos, and someone wanted to download them all, they would have to wait 4 hours to get them all, because of the download limit per hour.
Also the free rapidshare service only allows you to download at about 25kb per second now, where as yousendit can reach speeds of over 300kb if the conditions are right.
The only downside is the links die.
I have that Conan appearance on VHS, but no way of coverting it, sorry.