Blackmagic's free Davinci Resolve Lite software now supports UHD, which means you can correct footage at resolutions suitable for the new '4K' televisions. (i.e. 2160P 3840 pixels wide by 2160 tall)

You can download it for Windows here:

http://software.blackmagicdesign.com/DaVinciResolve/Lite/DaVinci_Resolve_Lite_10.0_Windows.zip

Linux and OSX here:

http://www.blackmagicdesign.com/support

This is pretty much the industry leading colour correction software, and the previous restriction of 1080P has been upped to Ultra HD, so it is pretty amazing.

The only differences from the full commercial package are very small, like support for only 1 CUDA card for rendering instead of multiple CUDA cards.

It is well worth considering if you are looking at doing colour correction of projects. When I used to use it, our setup was over a hundred grand! It boggles my mind that you can now do that on a PC and with the software being free.