I agree with flowrush.

I use a similar feature in Firefox all the time and it is a huge improvement to the user experience.

If you aren't doing this in Firefox yet, check it out: Tools -> Options -> Main -> When Firefox starts: Show my windows and tabs from last time

Sometimes you just have to interrupt what you're doing and reboot - being able to restart mIRC with everything exactly as it was beforehand (servers, channels, nicks, window order) is something that all users could benefit from.