Today I was over in our Mt. Laurel, NJ office for the first of two day's worth of IPv6 training.
IPv4, what is currently used for the vast majority of IP networks, including the Internet, has a 32 bit address space. The latest projections are that with the increasing demand for IP addresses due to ever increasing Internet usage and stuff like 3G and 4G phones, the IPv4 space will be exhausted somewhere in the 2008 - 2011 time frame.
In contrast, IPv6 has a 128 bit address space, making it several orders of magnitude larger than IPv4. It also includes better built-in security and improvements in routing and automatic address configuration.
Sun Microsystems maintains some web pages with information to get you started on learning about IPv6.
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