"Guilty" is the shit! I can't remember the last time I heard that it's been so long, but I remember the song well. I was a kid during the Bee Gees era, but my father used to play their music a lot, so that's how I got to like them.
I also like: Emotions
More Than A Woman
How Deep Is Your Love
I used to be in love with the movie "Saturday Night Fever", which brought them into mainstream culture and wound up buying the soundtrack a few years ago.
As far as other artists covering them: