I happen to have fallen deeply in love for Chase-Jack pairings and i'm happy to say i've seen more being made recently.
But I've also seem to have more and more pairing that i like to look for when i have the time.
But the thing that ticks me off is that i haven't seen any great increase in the fiction, heck not even a slight increase.
I hope if i make a list of the pairings i can be directed to a good site.
Or... you never know promt some writers to indulge me. ^^

I'm aware of both fanfic. & adult fanfic. but that about it for real sites.

.....so here is a good portion of my fav. pairings....(don't judge me)

Chase-Jack (Xaoilin Showdown)
Hotstreak-Richie (Static Shock)
House-Wilson (House M.D.)
Vlad-Danny (Danny Phantom)
Aqualad-Beastboy (Teen Titans)
Zuko-Sokka (Avatar the Last Air Bender)
Riff-Cain (Godchild/Count Cain)
Kevin-Edd/Double-D (Ed, Edd, & Eddy)
Megatron-Bumblebee (Transformers)
Hisoka-Gon (Hunter x Hunter)
Zoro-Luffy (One Piece)
Kakashi-Iruka (Naruto)
Gaara-Iruka (Naruto)
Hellboy-John (Hellboy)
John-Abe (Hellboy)