vitualbox

I'm just at the beginning of getting into VM ware and messing around with it at the moment. I typically just use multiple cheap computers but I've recently thought more into VM ware but I have a few questions. Which software do you recommend the most to do it? Is it better to run it...

Every program form black hat techniques is windows software only... maybe we should consider taking it to the Macintosh market too? If done right... then any new software released could be converted for Mac users too... what are your thoughts?