Many of you have probably have heard of the Magic Lantern Firmware
you can use with most of the new Canon DSLRs. Some might even be a little hesitant to do so as on Magic Lantern's website says "Do so at your own risk"
. Messing with the manufacturer's firmware can be dangerous if you don't know what you are doing and could void any warranty you might have. Having said that, the Magic Lantern Firmware is pretty awesome from what the spec sheet shows. HDR video is probably the most sought after feature for many 5D owners. It does have some limitations like filming fast moving subjects, but the video above was filmed with the new firmware for the 5DMKiii and the results look very good.
Click here to see the full list of features and link to download