The actress who does Pinkie Pie's singing in My Little Pony: Friendship is Magic also voiced Misa in Death Note. Also, Spike is Near. And in response to RadialThrone1, I think that's because a lot of the English anime dubs are done by Ocean Productions, so they use a lot of the same employees for different projects (in fact, it's likely why the above-mentioned fact exists-- a lot of the MLP voice actors also do work for Ocean).
In Adventure Time, Marceline's father is voiced by her VA's actual father. Also, Ron Perlman is the Lich; and BMO and Lady Rainicorn have the same voice actress.
Wooldoor Sockbat from Drawn Together is voiced by the same person who did Tidus in Final Fantasy X. On the subject of Final Fantasy, Sha'ira the Consort from Mass Effect one has the same voice actress as FFX-2's Paine.
In Adventure Time, Marceline's father is voiced by her VA's actual father. Also, Ron Perlman is the Lich; and BMO and Lady Rainicorn have the same voice actress.
Wooldoor Sockbat from Drawn Together is voiced by the same person who did Tidus in Final Fantasy X. On the subject of Final Fantasy, Sha'ira the Consort from Mass Effect one has the same voice actress as FFX-2's Paine.