One of the must have tools for every person doing anything related to IT security is definitely Nmap (I mean, which other tool, besides an SSH exploit Trinity used as well (and that wasn't a fake SSH exploit like the one released couple of days ago)). The Nmap developers work hard on this latest version which includes some very cool things like the Nmap Scripting Engine (NSE) which we even used to detect machines infected with the Conficker worm.

There are a lot of other neat new features and improvements, so don't wait and go to http://nmap.org/5/ to download your copy of Nmap.

--
Bojan