A great OpenSource cross-platform SGI-based STL - see http://www.stlport.org/doc/platforms.html for its range. Yes, Virginia, you can WriteOnceCompileAnywhere in C++ ...
Does it work?
BloodyOath! Check out the exhaustive regression tests that come with it if you don't believe me.
The last post on this page was in 2000. Is it still active? If the author is a geeky, introvert buried alive under piles of Dominoe's, Buds and network cabling, let him please take note that the year is now 2006.