Let's see... the Riolu egg I got on Pearl hatched shiny, and I've captured a shiny Kriketune and Shuppet.
Then from the GTS, I've got two shiny Lugia, three shiny Jigglypuff, a shiny Deoxys, Ho-Oh, Charizard, Gyarados, Rayquaza, Pachirisu, Floatzel, Pikachu, Mew, Darkrai, Dialga, Palkia, Regigigas, Seviper, Beedrill, Pichu, and Cresselia. A handful of them are most likely hacked, but most of them look legit.
From friends and people I've traded with on Serebii, there's also a Pidgeot, Shinx, Magneton, and Gastrodon.
Plus, the event Pichu.
That's my shiny list.