The good thing about Move is that usually it's ok to use it in high-end AAA hardcore games as optional. So in this case as developer you can aim to the entire console userbase, not only to the device userbase, getting better game sales.
Regarding 3rd party support:
Third Party Developers and Publishers Supporting PlayStation®Move platform Company Name (in alphabetical order, as of March 10, 2010):
505 Games U.S.
Activision Publishing, Inc.
AQ INTERACTIVE Inc.
ARC SYSTEMS WORK CO.,LTD
ATLUS Co., LTD.
Bigben Interactive
CAPCOM CO., LTD.
CCP
Crave Entertainment
CYBERFRONT Corporation
Disney Interactive Studios
Electronic Arts Inc.
FromSoftware, Inc.
Game Republic, Inc.
Game Republic, Inc.
GUST CO., LTD.
HUDSON SOFT CO., LTD.
IREM SOFTWARE ENGINEERING INC.
Koei Co., Ltd.
Konami Digital Entertainment Co., Ltd.
Majesco Entertainment
Marvelous Entertainment Inc.
NAMCO BANDAI Games Inc.
ONGAKUKAN Co., Ltd.
Oxygen Games
PAON CORPORATION
Q Entertainment Inc.
Q-GAMES, LTD.
SEGA CORPORATION
Sony Online Entertainment
Spike Co., Ltd.
SQUARE ENIX GROUP
TECMO, LTD.
THQ Inc.
UBISOFT®
Warner Bros. Interactive Entertainment
Zoo Entertainment, Inc.
http://scei.co.jp/corporate/release/100311e.html