nVidia Optimus on GNU/Linux.
Features
Full independent 3D on both video chips.
Auto power off for second X-server and nVidia chip.
Easy installation (look at Wiki).
Multiuser access.
Run in a way nvrun app.
Tested distros
Gentoo amd64
Debian Squeeze amd64
Debian Wheezy amd64
Fedora 16 (Verne) x86_64
Ubuntu 12.04 x86_64
Supported Models: All that supported by bbswitch, vgaswitcheroo (most of laptops with recent Linux kernel) + several by acpi_call (M11XR2, 1015PN, 1215N,
K42Jc, K52Jc, N53Jf, N53Jg, N71Jv, N73Jf, P52Jc, PL80Jt, U30Jc, U33Jc, U35Jc, U36Jc, UL80Jt, N53Sn, U41Sv, N53Sv, N61Jv, N73Sv, P31Jg, U43Jc, UL30Vt, E6420,
InspironN5110, XPSL702X, Vostro3300, Vostro3500, XPS15, ThinkPadT410, ThinkPadT420).
Video on YouTube: http://www.youtube.com/watch?v=c6RH69j-gMY&feature=plcp&context=C3f5cbeeUDOEgsToPDskLOX8DnELkwYsi2QZ7_phwJ