Riku and Daisuke Links
Vanilla Girl
A beautiful and fantastic shrine to Riku Harada. I love this site. There's lots of information and even has screencaps to the anime.
Fanfiction.net C2 - Real Love
A lovely collection of Daisuke and Riku fanfictions. This is great considering Daisuke and Riku fanfics are surprisingly hard to find. :D
Fanfiction.net C2 - Damage Control
Dark and Riku fanfics. Technically not Daisuke and Riku, but this couple is lovely as well.
DESTINED
A Riku and Daisuke fanlisting. (I thought there wasn't one. T_T But was so happy to have found one.)