Watched it fine over here not a single drop out or lag the whole way through, which is odd considering I run on a 256Kbit connection.
All I have to say about Leopard is WOW!
I saw the list of features on the website and was a little skeptical but when shown just how they work they absolutely flawed me. Personally this is now a must upgrade when it touches down although there are a lot of feature that many can live without though.
I am going to ABUSE Webclip, core animation is going to make OSX apps like a god compared to what Vista is turning out. They are really going head first against Vista this time around and the comparison they had was brilliant, I've found my new fave PR guy and his accent just made it.
Mail is looking cool and now I have a real reason to finally start using iChat. As for Spaces, I agree it is just like Virtuedesktops but it will be nice to have it running at a system level it may use a little less resources and that's always a bonus.
The number one feature though was Time machine, that is really something. The best I've had with any app like that was Wayback on the PC and it only work at a system wide level and not file level, it really is an inspirations apps that one.
Overall another great update and one that has me hyped. Rock on Spring, I now know when to by my next machine.