I've really never dabbled much in fingerstyle guitar, but have been working to change that recently. Tunes that I'm practicing regularly now:
Dylan - Don't Think Twice
Clapton - Nobody Knows You When You're Down and Out
John Mayer - Neon
James Taylor - Fire and Rain
I play with the pads of my right hand fingers, so if I don't play regularly my fingers get kinda shredded. Never figured out the nail thing, other than the occasionally strummy type rake with the tops of the nails.