It basically means the next generation of the internet. Read all about it here:
"Web 2.0 is the business revolution in the computer industry caused by the move to the internet as platform, and an attempt to understand the rules for success on that new platform. Chief among those rules is this: Build applications that harness network effects to get better the more people use them. (This is what I've elsewhere called 'harnessing collective intelligence.')".
Here's a complete page about it if you really want to get in-depth:
wood_workur, are you thinking of IPv6? That's the one they want to widely deploy, because they are running out of addresses. Currently, we use IPv4.
IPv4: 127.0.0.1 (32 bits long)
IPv6: 2001:0db8:0000:0000:0000:0000:1428:57ab (128 bits long)