Direct Access is one of the coolest features I used since a quite while. I am part of our internal pilot since months and it is absolutely great: You connect to the Internet and you are immediately connected to the corporate network. No VPN, nothing.
If you want to know how to set this up, there is a guide for this: Step By Step Guide: Demonstrate DirectAccess in a Test Lab
I read a marketese paper on this and called the folks in PR to ask: "if this isn't a VPN then what's the difference between it and a VPN?" and they didn't want to give me a straight answer. Do you have one?
I think it's sort of SSL VPN but i guess Roger can answer this one in much better way...
No, it is more a combination of IPSec, IPv6, NAP etc. Let me work on a post to explain a little bit better how it really works
it will be very nice if u can write a post on,how directaccess is different then VPN.