Here is a list of new anime. The number of new shows will mark a record high in the history of Japanese animation. i think that all these shows started in the spring of this year.
A. TV Anime
04/01 Gakuen Heaven / AT-X / Sat.09:00 / Tokyo Kids
04/01 Fushigiboshi no Futago Hime Gyu! / TV Tokyo / Sat.10:00 / HAL Film Maker
04/01 Youkai Ningen Bem / Animax / Sat.19:00 / Studio Comet
04/01 Fighting Beauty Wulong REBIRTH / TV Tokyo / Sat.24:55 / TOMS Entertainment
04/01 Soul Link / Chiba TV / Sat.25:35 / Picture Magic
04/01 Yoshinaga-sanchi no Gargoyle / Chiba TV / Sat.26:05 / Studio Hibari
04/01 BLACK LAGOON / Chiba TV / Sat.26:35 / Madhouse
04/02 KIBA / TV Tokyo / Sun.08:30 / Madhouse, Studio Live
04/02 Digimon Savers / Fuji TV / Sun.09:00 / Toei Animation
04/02 Onegai My Melody ~Kurukuru Shaffle!~ / TV Tokyo / Sun.09:30 / Studio Comet
04/02 Himawari! / Chiba TV / Sun.23:30 / ARMS
04/02 Suzumiya Haruhi no Yuutsu / Chiba TV / Sun.24:00 / Kyoto Animation
04/02 ARIA The NATURAL / TV Tokyo / Sun.25:00 / HAL Film Maker
04/02 School Rumble Nigakki / TV Tokyo / Sun.25:30 / Studio Comet
04/03 Bakegyamon / TV Tokyo / Mon.18:00 / RADIX
04/03 Simoun / TV Tokyo / Mon.25:30 / Studio DEEN
04/03 Joshikosei GIRL'S-HIGH / TV Saitama / Mon.25:30 / ARMS
04/03 Utawareru Mono / Chiba TV / Mon.26:40 / OLM TEAM IWASA
04/03 Strawberry Panic / TVK / Mon.26:45 / Madhouse
04/04 capeta (chuugakusei hen) / TV Tokyo / Tue.17:30 / Studio Comet
04/04 Animal Yokocho (2nd season) / TV Tokyo / Tue.18:00 / Studio Gallop
04/04 Furakappa / TVK / Tue.18:45 / Office AO
04/04 Gintama / TV Tokyo / Tue.19:00 / Sunrise
04/04 Makai Senki Disgaea / Gifu Hoso / Tue.24:15 / OLM
04/04 Ouran Kouko Host Club (Ouran High School Host Club) / NTV / Tue.24:50 / BONES
04/04 Air Gear -Ama Kakeru Tsubasa- / TV Tokyo / Tue.25:00 / Toei Animation
04/04 LavugecCHU ~Miracle Seiyuu Hakusho~ (Love-get-CHU ~Miracle White Paper on Seiyuu~) / TV Tokyo / Tue.25:30 / RADIX
04/04 Renkin Sankyu Magical? Pokaan / Chiba TV / Tue.25:30 / REMIC
04/04 Higurashi no Nakukoro ni / Kansai TV / Tue.26:00 / Studio DEEN
04/05 Spider Riders ~Oracle no Yuusha-tachi~ / TV Tokyo / Wed.17:30 / Bee Train
04/05 Shibawanko no Wa no Kokoro / NHK Sogo / Wed.23:00 / Three Day
04/05 NANA / NTV / Wed.23:25 / Madhouse
04/05 Inukami! / TV Tokyo / Wed.25:00 / Seven Arcs
04/05 .hack//Roots / TV Tokyo / Wed.25:30 / Bee Train
04/05 Witchblade / Chuubu Nihon Hoso / Wed.25:45 / GONZO
04/05 RAY The Animation / Touhoku Hoso / Wed.26:00 / OLM
04/05 Yume Tsukai / Chiba TV / Wed.26:00 / Madhouse
04/05 Princess Princess / TV Asahi / Wed.27:10 / Studio DEEN
04/05 The Frogman Show / TV Asahi / Wed.late-night / Frogman
04/05 Yoshimune / Tokyo MX TV / Wed.late-night / AIC Spirits
04/06 ZEGAPAIN / TV Tokyo / Thurs.18:00 / Sunrise
04/06 xxxHOLiC / TBS / Thurs.25:25 / Production I.G.
04/06 Ah! My Goddess ~Sorezore no Tsubasa~ / TBS / Thurs.25:55 / AIC
04/06 Ring ni Kakero 1: Nichibei Kessen Hen / TV Asahi / Thurs.26:42 / Toei Animation
04/07 Keroro Gunso (Third Year) / TV Tokyo / Fri.17:30 / Sunrise
04/07 Kirarin Revolution / TV Tokyo / Fri.18:00 / Synergy SP
04/07 Nishi no Yoki Majo -Astrea Testament- / KBS Kyoto / Fri.25:30 / HAL Film Maker
04/08 Saiunkoku Monogatari / NHK BS2 / Sat.09:00 / Madhouse
04/08 Shoujo Janggeum no Yume / NHK Sogo / Sat.19:30 / HEEWON Entertainment
04/10 Shinseiki Duel Masters Flash / TV Tokyo / Mon.06:45 / Synergy SP, G&G Entertainment
04/12 Hime-sama Goyojin / WOWOW / Wed.24:00 / Nomad
04/13 Sasami Mahou Shoujo Club / WOWOW / Thurs.18:00 / AIC Spirits
04/13 The Third ~Aoi Hitomi no Shoujo~ / WOWOW / Thurs.24:30 / XEBEC
04/13 Jyuohsei / Fuji TV / Thurs.24:45 / BONES
04/15 TOKKO / WOWOW / Sat.24:30 / Group TAC
04/29 Tsubasa Chronicle (2nd season) / NHK.Edu / Sat.18:25 / Bee Train
04/-- Zenmai Zamurai / NHK.Edu / Mon.07:50 / ?
04/-- Garasu no Kantai (Glass Fleet) / TV Asahi / late-night / GONZO, Satelight
04/-- Poka-Poka-Mori no Rascal / UHF Local / -- / Nippon Animation
04/-- Sarugecchu / -- / -- / ?
05/18 Kamisama Kazoku / Animax / Thurs.22:30 / Toei Animation
05/-- Kishin Houko: Demonbane / WOWOW / -- / View Works
05/-- POCOYO / WOWOW / -- / Zinkia S.L.
B. OVA
03/24 Kakyusei2 ~Anthology~ Vol.1 / Inugoya
03/24 Top o Nerae2! Vol.5 / GAINAX
03/24 Kyou no 5 no 2 Vol.1 / Shinkukan
03/24 Eien no Aseria: Ugoki Dashita Shukumei / Studio Matrix
03/24 TANK S.W.A.T. 01 / DoGA
03/24 Prince of Tennis -Zenkoku Taikai Hen- Vol.1 / --
03/24 I"s Pure Vol.4 / Rivapool
03/24 sin in the rain Vol.1 / Mook Animation
03/29 Memories Off #5 Togireta Film The Animation / Doga Kobo
03/29 Fullmetal Alchemist Premium Collection / BONES
04/05 Daimahou Touge Vol.1 / Studio Barcelona
04/28 Angel's Feather Vol.1 / VENET
04/28 Baldr Force Exe Resolution 01 Taido ~a sign~ / Satelight
04/28 Mitsu X Mitsu Drops Vol.1 / --
05/26 Fullmetal Panic! The Second Raid Special OVA "Warito Himana Sentaicho no Ichinichi" / Kyoto Animation
05/-- Cream Lemon New Generation Vol.3 / Movanimation
05/-- Cream Lemon New Generation Vol.4 / Movanimation
06/-- Kyou no 5 no 2 Vol.2 / Shinkukan
06/-- Angel's Feather Vol.2 / VENET
06/23 Kakyusei2 ~Anthology~ Vol.2 / Inugoya
C. Anime Movies
04/08 Tachiguishi Retsuden / Production I.G
04/08 Hanare Toride no Yonna ~Yonna in the solitary fortress~ / Kengo Takeuchi
04/15 Detective Conan ~Tantei-tachi no Requiem~ / TMS
04/15 Crayon Shin-chan: Densetsu o Yobu Odore! Amigo! / Shinei Doga
--/-- Mahou Sensei Negima! Spring Version / Shaft
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it's a shame that it will take forever for us to see them