Motorola Atrix 4G was rooted by the well-known AT&T developer designgears along with Getaphixx.
Gaining root access on allows one to remove bloatware taking up precious memory space, customize the device to heart's content, and poke around in the internal system. But the best part or the bonus is that one is able to use backup tools and backup the device.
Thanks to these people now, Atrix 4G users will be able to take full control of the device they paid for with their hard earned cash from the launch day.
AT&T has restricted Application sideloading on the bunch of Android devices AT&T released. Thanks to Root privileges, one will also be able to enable app sideloading!.
As always exercise care when you mess around with devices and firmware. Briefmobile, where the process is listed says the process is SAFE. If you find the development by these developers helpful (it is helpful otherwise you will be AT&T's dog, like iPhone dudes), You can donate to designgears for his work here. Also, make sure to throw Getaphixx donations for his device and his work on the root process.
XDA-Dev Forum and BriefMobile