sorry for saying Y2K but I was just curious.
About what?  Anyway, the only Y2K (geesh!) bug I found is that my mail reader (SLRN) seems to have gone haywire.  I haven't had time to figure out whether it's actually SLRN, or if the mail server here is fried! -PSE
LV: I don't think that slrn uses Tcl, does it? There has been at least one report on 
news:comp.lang.tcl
 of some problems (unlikely to be directly related to y2k) with Tcl's clock command and calculating forward dates.  Interestingly enough, I also have seen similar problems in two different C programs.  The weird thing in all of these cases is that the software appeared to work find BEFORE Jan 1, 2000 .  Weird, huh?
PSE: Nope, SLRN does not use Tcl.  It turned out to be the mail server, not SLRN.  I don't know if the mail server uses Tcl.  In any case it was fixed... or fixed itself.  Most of the y2k problems I heard about seem to have gone away since those large bat-winged creatures with human faces flew off.
BG: But 
TkRat[
1] 
does use Tcl - tkratshell is a special purpose wish linked with UW's c-client IMAP/POP3 library.  If you are using it, and your sent-mail box has started to grunge up, look for years on the mbox divider "From " lines that say 
19100 instead of 
2000.  Known bug, but commonly unfixed.  
Postilion[
2] uses the same custom wish.