Here are other threads:
BlueStacks android on windows out now !!
BlueStacks: Android Apps on PC
Bluestacks Android on Emulator Alpha release
[Q] How to run multipple apps/windows simultaneously
Whats this in an Apple Mac (Linux and Mac users users chmod +x run.sh and run it)
And, here is the software to download. If you look closely they are also developing a mac edition. Enjoy!