gcc3 Available for Mac OS X
drc writes in that MacSlash notes that, according to the Apple gcc3 list, "The gcc3 project has been 'closed' for Jaguar, meaning that at this point there is almost no chance that there will be any further changes to the compiler that ships with Jaguar." If you really want to play, break out CVS and get to it.
AFAIK, all the major Linux and BSD distributions are still built using 2.9x versions. I've got to give credit to Apple for being the first major vendor out the door with a gcc3 based distribution. It's about time somebody started pushing the 3.x series forward. As a C++ developer, I've grown increasingly tired of dealing with the bugs, limitations and obsolete libraries of the various 2.9x trees.
It's not way out of date. The GCC delivered in the April developer tools is version 1041, based on gcc version 3.1 20020105 (experimental). This is version 1151; Quite a bit newer, and also signifies the code freeze for the version that will ship with Jaguar.