From FreeSoftware Mac User Group:
Portable Adium is the multiprotocol Adium
instant messaging client that can connect to AIM, MSN, Jabber, Yahoo, and more, packaged as portable application so you can carry around with you on any portable device, USB thumb drive, iPod, portable hard drive, memory card, other portable device as long as it has 65 MB of free space and use on any Mac OS X computer, taking your conctact list, emoticons, message stiles, plugins, scripts, sound and users with you.
Using your data
You can copy your user preferences folder to Portable Adium when "Copy preferences" window ask you.
Adium application, preference file and profile folder are inside the bundle:
Support Forum - Post questions, tips, suggestions, clues, helps, bugs to our Portable Apps OS X support forum: http://www.freesmug.org/forums/portableapps