Yep, the mIRC executable was what tjm4fun had go missing. I couldn't duplicate that though, but I had an executable I swear I transfered from one of my other boxes that didn't show up. I can't even remember what it was, but I had copied it with winscp to my desktop in a Windows XP virtual machine and went to get it and it was gone.

P.S. again, Antivir didn't delete it during the normal course of operations. There was no prompting, no report, no quarantine... nothing, just gone.

P.P.S. I *think* it's fixed. All I can say is that I haven't seen it happen again (and I haven't heard Tom complain about anything either and I see him every night on IRC)