Every good OS must have it. I think, it will be implemented in MOS very soon.
Now, I use well configured Directory Opus instead of Ambient.
JACK - 3D gfx artist
Config:
Pegasos 2 G3/600 MHz, 256 MB SDRAM (Kingmax), ATI Radeon 9200 Pro 128MB, 120 GB HDDMy new web:
http://jack-3d.wz.cz