I think this article highlights how backwards Apple can be on things.  There are really no advantages to having your browser be 64-bit (I could imagine how you could have a 4GB+ browser process but its really not the most common use case).<p>I have really been impressed with how well Windows does 64-bit.  The 32-bit layer just works.<p>Also, Apple is always a pain about anything GPU related.  Usually you have to buy through them at an absurd premium, then you are usually dealing with an older opengl version.  They are not the platform to use if you are interested in having decent graphics acceleration.