how does the management system of the gmail work? what are the advantages it has on offer. the extra memory and excellent search support is mouthwatering but the mail management system is what might bring in more of the corporate guys in on it.

What exactly do you mean with mail management system?
I find Gmail to be a great (the best I know) web mailer for other reasons than just its 1 Gigabyte of free storage. For example, conversations, filters, forwardings, great spam filter, labeling, and much more.