Kevin Mukbel sent this tip that discusses recovering all of the files referenced in your drawing with one command.  Did you know that with AutoCAD 2008/2009 there is a command called RECOVERALL? It is my favorite. This new drawing utility allows you to run the recover process on a drawing and all the associated xrefs.

Notes from Cadalyst Tip Patrol:  Before AutoCAD 2008 you had to recover each xref file one at a time, if you could open your file to figure out which ones it referenced.  With the RECOVERALL command, you will automatically recover your drawing and every xref in it.  Very handy, good tip. Tested in AutoCAD 2009