GLUT is a nice multiplatform library.
Separated patches exist that add mouse wheel and multi-monitor support and allow exiting main loop.
For your convenience, I put these useful patches together and made them compatible with vs2003/2005/2008.
Download: precompiled win32 binary or source code patch (hints on patch application).
Background: I tried to use GLUT replacements first, but I run into complicated incompatibilities. This patch immediately and safely fixed my problems.