In the workstation sector you won't see SLI yet (although it has been launched.) However, 3Dlabs have a dual GPU card out and Anandtech are checking it out.
Unlike the NVIDIA SLI solution, the VSU handles all scene splitting tasks in its Breaker/Distributer. This offers many important advantages, including the fact that software support is not required for full hardware utilization. Having a unified 512MB framebuffer into which both GPUs are connected gives the Wildcat Realizm 800 its definitive multiGPU advantage. All scenes can benefit from geometry and fragment acceleration equally and transparently.
[The article]