sorry guys i forgot to mention that part. it will run on any os. you need to download and install adobe air from here
http://get.adobe.com/air/?promoid=BUIGQ
it should be able to run on tiger or possibly even panther, i have only tested on leopard and windows xp.
ok here are the official sys req for air sorry for not posting earlier
Windows
* Intel® Pentium® 1GHz or faster processor
* Microsoft® Windows® 2000 with Service Pack 4; Windows XP with Service Pack 2; or Windows Vista® Home Premium, Business, Ultimate, or Enterprise
* 512MB of RAM
Mac OS X
* PowerPC® G4 1GHz or faster processor or Intel Core™ Duo 1.83GHz or faster processor
* Mac OS X v10.4.910 or 10.5.1 (PowerPC); Mac OS X v10.4.9 or later, 10.5.1 (Intel)
* 512MB of RAM
For Adobe® AIR™ applications featuring full-screen video playback, the following hardware configurations are recommended:
Windows
* Intel Pentium 2GHz or faster processor
* Windows 2000 with Service Pack 4; Windows XP with Service Pack 2; or Windows Vista Home Premium, Business, Ultimate, or Enterprise
* 512MB of RAM; 32MB of VRAM
Mac OS X
* PowerPC G4 1.8GHz or faster processor or Intel Core Duo 1.33GHz or faster processor
* Mac OS X v.10.4.9 or later or 10.5.1 (Intel or PowerPC; Intel processor required for H.264 video)
* 512MB of RAM; 32MB of VRAM