Welll Here A few I've watched . . I'm on the Look Out for some too >_<
There's (my Favorite one) Gravitation . It's Funny, Cute and Great Story Line . . But I suggest to read the Manga First. Infact it's Still Going On
There's Junjou Romantica . VERY FLUFFY! and There 3 yaoi pairings! =O
There The Two I've Watch and I Loved them both . . But I went online for you and Serch up a List for you ^w^
After School in the Teachers` Lounge
Ai no Kusabi
Angel's Feather
Antique Bakery
Be-Boy Kidnapp`n Idol
Boku no Piko
Boku wa Kono Mama Kaeranai
Bronze: Zetsuai Since 1989
Enzai
Fake
Fish in the Trap
Fujimi Orchestra
Fuyu no Semi
Gakuen Heaven
Gravitation: Lyrics of Love . .< NEVRE KNEW ABOUT THIS NOW!? XD
Haru wo Daiteita
Ikoku Irokoi Romantan
Kasho no Tsuki
Kaze to Ki no Uta SANCTUS -Sei naru kana-
Kimera
Kirepapa
Kizuna
Kizuna: Koi no kara Sawagi
Koutetsu Sangokushi
Kusatta Kyoushi no Houteishiki
Kyou Kara Maou!
Lesson XX
Level-C
Loveless
Marginal Prince
Mirage of Blaze
Mirage of Blaze: Rebels of the River Edge
My Sexual Harassment
Okane ga Nai
Papa to Kiss in the Dark
Princess Princess
Ryokunohara Meikyuu
Saigo no Door wo Shimero!
Saint Beast
Saint Beast ~ Ikusen no Hiru to Yoru Hen ~
Saint Beast ~ Kouin Jojishi Tenshi Tan ~
Seikimatsu Darling
Sensitive Pornograph
Sukisho
Yami no Matsuei
Zetsuai 1989
Now Last . . . Ouran High school Host Club . .. You could Maybe Say this is a Yaoi Because Mori and Honey-Sempai Are In Love (I think) and we have the All mighty Twincest XDD It's Has Very Yaoi Bit's in it But it's not the main thing and There is a Girl which the Twin have a crush on and The main host =/ But Try it anyway!
I believe Samurai 7 may have some shonen-ai, but not "YAOI yaoi" if you know what I mean.
Also, Hetalia has a lot, and I mean a LOT, of yaoi fanfictions, but I don't think the actual anime has canon yaoi. It does, however, have some shonen, because of France and his rose. -.-