This totally outrageous story explains how Bush misused the interim appointment power. In this case, he tried to bypass congressional approval claiming he could appoint Sam Fox, (a big fundraiser for the swift boat campaign) to an interim appointment because congress was in the middle of a one week recess.
What's next? Night time appointments? The claim that since congress wasn't in session at 4:00 a.m he can bypass them? Senator Chris Dodd's comment? "Bush's actions were "deceptive at best and illegal at worst." I'm inclined to go with the latter.