Oricon has released the yearly sales rankings of anime music media for fiscal 2011. Seiyu Mizuki Nana has been at the top for two consecutive years. Her music Blu-ray "Nana Mizuki Live Grace -Orchestra-" released this October has made up half of her sales.

Seiyu Total Sales Rankings Top 5
1, 820 million yen Mizuki Nana
2, 420 million yen sphere
3, 170 million yen Tamura Yukari
4, 140 million yen Toyosaki Aki
5, 120 million yen Hirano Aya

Anime Song Rankings Top 5
1, 257,932 Crayon Shin-chan "T.W.L" "Yellow Pansy Street"
2, 216,239 Detective Conan "Don't Wanna Lie"
3, 151,056 Nintama Rantarou Movie "Yumetamago"
4, 142,810 Kyou, Koi wo Hajimemasu "Kakko Warui I love you!"
5, 129,046 Fullmetal Alchemist: Milos no Seinaru Hoshi "Good Luck My Way"

Anime Song Rankings Top 20 (without tie-in songs) (as far as I searched)
*1, 87,209 Dog Days "Scarlet Knight"
*2, 82,182 Mahou Shoujo Madoka★Magica "connect"
*3, 53,386 Uta no☆Prince-sama♪ Maji Love 1000% "Maji Love 1000%"
*4, 48,994 Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai "secret base ~Kimi ga Kureta Mono~"
*5, 48,403 Mahou Shoujo Madoka★Magica "Magia"
*6, 47,932 The iDOLM@STER "Ready!!"
*7, 44,759 Fate/Zero "oath sign"
*8, 32,973 Fate/Zero "Memoria"
*9, 31,198 Ore no Imouto ga Konnani Kawaii Wake ga Nai "nexus"
10, 29,313 IS: Infinite Stratos "Super∞Stream"
11, 28,968 The iDOLM@STER "Change!!!!"
12, 28,599 Ro-Kyu-Bu! "Shoot!"
13, 28,104 C³ "Endless Story"
14, 28,070 Guilty Crown "My Dearest"
15, 25,624 Tiger & Bunny "Seigi no Koe ga Kikoerukai"
16, 24,856 Prince of Tennis "Love Festival"
17, 24,690 Macross Frontier: Sayonara no Tsubasa "Hokago Overflow"
18, 24,437 Denpa Onna to Seishun Otoko "Os-Uchujin"
19, 24,435 Hidan no Aria "Scarlet Ballet"
20, 23,787 Dragon Crisis! "Immoralist"

Anime Album CD Rankings Top 5
1, 138,237 Gintama Best 2
2, 104,163 Macross Frontier: Sayonara no Tsubasa netabare album the end of "triangle"
3, *36,984 Rurouni Kenshin Complete Collection
4, *30,045 Panty & Stocking with Garterbelt The Original Soundtrack
5, *28,848 Bleach Berry Best (Dec 2010, total 64,269)

Sources: Oricon Youtaiju, Oricon Biz