last i knew it was still beta?.?. i havent tried it, im very content with cs3 right now.
its out of beta, as of a few days ago (at least for MC CS4, Flash CS4 has been out fo a while)
there is no one torrent you can get, a verifed method of getting it is getting lightshow and registering it (with cracks and serials and fake info) and then you can paste a link to an image of MC CS4 and download it from adobe
only way i know
EDIT: after you register, dont dwload lightshow, just paste the above addresses (all of them)
and what i posted was completely legal!!! w00t
EDITing my EDIT: just an hour after i made this post, adobe changed the name of there product on the server.......... so you cant use that method above
however whenever someone finds another way to dwload it from adobe we are stuck with torrents (remeber guys i like legal, i have serials for the stuff i use, or i just use trials... you should to)
but here is a good torrent, with the files from above 
if you dont have a demonoid account send me a PM