The fastest graphics card available at the cheapest price I've found online.
It seems as though the competition from Nvidia's new releases has had a little impact on prices.
This is still expensive and only really worthwhile if you have a high end CPU, a high end PSU and some large scale high definition displays which need this kind of graphics horsepower. If this doesn't sound like you, there are deals around for ATI 5770, 5850, 5870 and Nvidia GTX470 graphics cards that will max out lesser systems. These will give better frames per second per pound.
But if you need the fastest, this is the hottest deal around!
More techy info below
2GB GDDR5 memory
ATI Eyefinity technology with support for up to three displays
Windows 7 support
ATI Sream technology
Designed for DirectCompute 5.0 and OpenCL
Accelerated Video Transcoding (AVT)
Compliant with DirectX® 11 and earlier revisions
Supports OpenGL 3.2
40 nm Process technology
ATI CrossFireX multi-GPU support for highly scalable performance
ATI Avivo HD video and display technology
Dynamic power management with ATI PowerPlay technology
Display Port, 2xDL-DVI
PCI Express® 2.0 support