I read in another site about releasing the unity3d 3 beta for free download and there was a link for the windows version, where can i find the mac version?
If you purchased Unity ahead of time, then the beta key will be emailed to you and the app as well. Otherwise you have to wait.
Only exception is the Unity3 alpha link for the Linux version, which is freely available due to the large testing demand, as i’ve heard. :O)
Hmm, I didn’t know that. Neat 
Due to your signature i just had a look at the answers link.
Dude this is heavy, how should i say best, individual design. I suspect, mainly for people who are living in a world with very high resolutions or they are resting far far away from their computers, entering their hyperbolic commands through some devices which are physically disconnected from their machines and sent through the ether at speeds faster than light.