Neil Young has pretty much always sucked; back in the early 70s, he pretty much embodied everything that was wrong with pop/folk-rock music although he has had a decent number or two like Rust Never Sleeps and Wonderin' (which had a hilarious video.) CS&N started great with Suite Judy Blue Eyes and went downhill quickly from there; I think they're folkie chicks in disguise, really ugly ones.
The one Neil Young clip worth seeing, but I still think Link Wray could've done it better...
http://www.youtube.com/watch?v=qIMttc0ciKU