What library functionality would you most like to see in D?

[so]

On Sun, 31 Jul 2011 14:51:17 +0300, Peter Alexander  
<peter.alexander.au at gmail.com> wrote:

> - Fast vector math library suitable for games.

Speed is mostly up to the compilers' ability to optimize, especially  
inlining in this case.
We already have math libraries and there are one in the works for phobos,  
if they are not enough for you please everyone state your requirements.