How many artists have done a cover of this song?

I just overheard my coworkers in their office say Eric Clapton did the original. I didn't think that was right. So I googled it and saw it was Bob Dylan. So then they said EC also did a cover. I didn't believe them, but googled that and got hits. Then I saw it was done by Guns N Roses and Avril Lavigne. Any others? Is the song really worth that many remakes???