This is where I become rapidly aware I never bookmark anything! But off the top of my head, I'm going to point you to Sandrine. There's a good Robin/Guy (WARNING for big end of S2 spoiler if you haven't come across that already) and a *very* good Robin/Guy/Marian, if that's your cup of tea.
And there is vaguely a sequal to King of the Oak in my head, but as it took me forever to write the last one, I'm not making any predictions about it. :-D
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http://sandrine.livejournal.com/tag/fic:+robin+hood
And unsentimentalf's stuff below, but WARNINGS for roughsex and bits of non-con and end of S2. Very good though.
http://unsentimentalf.livejournal.com/tag/robin/guy
And there is vaguely a sequal to King of the Oak in my head, but as it took me forever to write the last one, I'm not making any predictions about it. :-D