[blatant self promo]
The wonderful open source Allegro team has released version 4.0 of their lib. It is a very, very stable, cross platform lib to take advantage of full on graphical, sound, and input device support. Plugins include things like CD and MP3 functions and tying in OpenGL. It utilizes the best libs on your platform to take advantage of hardware acceleration where applicable.
In the past it has had one weakness - pain to install. Now for the release of 4.0 I've put together a graphical, point and click installer for Allegro. All you need is my download, nothing else needs to be done.
Currently supported compilers are:
Microsoft Visual C/C++
Dev-C++ (mingw and possibly cygwin)
Borland 5.5 (possibly 4.5 and higher)
Get it here!
[/blatant self promo]