It's been a little while, so I thought I would drop this off for your review to go along with the portable topic. This eWeek article is referencing a portable pen-testing device, called "Silica". I did not research the company yet, but it sounds interesting to take a look. Take a read when you get a chance.

'Pen' Testing in the Palm of Your Hand
By Ryan Naraine
August 15, 2006

A portable hacking device equipped with hundreds of exploits and an automated exploitation system will go on sale in the United States in October.

The wireless handheld, called Silica, is the latest product to be developed by Immunity, a Miami-based security company that sells penetration testing products and services.

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http://www.eweek.com/article2/0,1895,2003853,00.asp