Memoryforyou.net is my favorite resource for all the dujinshis that I read.
My favorite one would be "Kimi ga Koi ni Ochiru", astory of a guy that fell in love with the brother of his first love. Really nice drawings and good story too.
My second best favorite is "Kiss Ja Tomaranai" That is because the guys are just too cute and the story is nice.
Well, dont just take my word for it. Check out the site yourself. ^_^