Blind IP spoofing portscan tool?

[Curt Wilson <netw3 () netw3 com>]

In the mailing for the Black Hat briefings, there is 
mention of a "blind IP spoofing portscan tool" or 
something along those lines. I'm curious about this 
tool, what is it's name and what is the mechanism by 
which it works? I'd guess that it's something involving 
other elements of the IP stack or some tool that uses 
a 3rd party system to check IP ID's, sequence 
numbers, ICMP responses or something along those 
lines.

I'd be interested to know more information, please 
share if you have this knowledge.

PS - I'm moving to Chicago soon and looking for a 
good security job, anyone got any leads?

Curt Wilson
netw3 () netw3 com