mark++

For you command-line junkies, I present size.exe. You can use it to resize a console window programmatically. Here’s an example:

  C:\scripts >type vimdiff.cmd
  @echo off
  size 60 120
  vim -d %*
  size 60 80

I wrote this in C++ using Boost. If you’re interested, the source is available here.

Update 4/8/2008:
Turns out that Windows actually does have built-in support for this, it’s just hidden in a dusty corner as usual. Good thing, too, because my program didn’t work worth a damn. Here’s the official method:

   mode 120,60

(Credit to Sahil Malik)