Any distro which runs on a 386 or 486 chip would do, such as Debian (as mentioned), Slackware, SuSE among the biggies. You'd have to cut out a lot of software from the default install to fit one of these on a 1 gig drive.
The main thing is not to try and run KDE or Gnome, but stick to the lightest window manager you can find: fluxbox, for example.
However, with so little RAM, I would suggest you try and find a console IM app, in which case you needn't bother installing a window manager or an X server at all.
Last edited by mugstar; 07-23-2004 at 05:56 PM.