i tryed using some Adium away applescripts for QuickSilver posted at  blacktree but couldn’t get them to work, either no one ever tested it or they were designed for a really old Adium version.
So i wrote a couple of simple QuickSilver plugins to support setting away and back on all accounts on Adium 1.2+.

You can download them here!

Just unpack the zip and copy the applescript files to  “~/Library/Application Support/Quicksilver/Actions”, you might have to create the “Actions” folder.
Restart Quicksilver and you’re done, just type “Adium set away” or “Adium Back from Away” in QS to use them :)