Windows Surface RT Jailbreak Tool Released
It was only a matter of time.
Recently, it was reported that Windows RT had been jailbroken, allowing unsigned desktop apps to be run on the device. After an investigation, Microsoft issued a statement that applauded the efforts of the jailbreaker clrokr after determining that the jailbreak "is not a security vulnerability and does not pose a threat to Windows RT users." However, Microsoft also stated that there were no guarantees that the company wouldn't patch the exploit sometime in the future.
From then on, it was only a matter of time before the exploit reached the hands of the general public. XDA Developers member netham45 made public a batch file that simplifies the process of the jailbreak. clrokr's exploit involved modifying a value to alter the minimum signing level of Windows RT, allowing unsigned apps to run. Unfortunately, this value must be adjusted in the memory as the OS is running, as the value in the kernel cannot be adjusted, therefore the exploit must be repeated with every reboot.
This exploit can stand so long as Microsoft doesn't release an update to patch the issue. From the statement that Microsoft's released, it doesn't seem like an urgent issue for the company. After all, the exploit is limited because it's impermanent, and, as netham45 points out, useless since RT users can roll back to a previous version using recovery partitions.

That would be true, but look at Apple's App Store. One can find malicious apps even in that legitimate source, so that is NOT a guarantee.
Bottom line is, let the consumer decide what they want to put on their device. If they want to take chances, up to them. If not, give them the information and let them take action (or not).
...due to the lackluster interest in the devices and dismal sales
That's like complaining about being unable to run Windows apps on iOS. They're very different operating systems and they're used on different CPU instruction set architectures that are not inter-compatible. Even if MS put the huge effort into making it possible, it'd work with a big performance hit on an already limited ARM SoC.
Bottom line is, let the consumer decide what they want to put on their device. If they want to take chances, up to them. If not, give them the information and let them take action (or not).
Sure, it's not a guarantee, but it's pretty close. That has to count for something. If the consumer wants to put something not validated on their device, then they have that option through "jailbreaking".
There are no ARM desktop apps you twat. If you want to run x86 applications, get a Surface Pro in a few weeks
Id love to dual boot my Tablet. and I dont want to buy another SAME nvidia Tegra tablet just to get windows RT ...
I wish MS releases windows RT
I dont blame the DRM developers for developing poor DRM, I blame whoever got the idea to implement it in their software.
So that people won't complain about unsafe ecosystems while enthusiasts willing to jailbreak can do so?
Possible. However, I don't recall anyone ever complaining about windows being too open and able to run more software than all the other platforms combined. Anyone willing to publish a windows thing, was able to and still can do so.
I can see why would Apple impose such a ridiculous concept on its own users, but MS?
One of the biggest advantages of the x86 architecture is that it has an extremely mature firmware standard (BIOS and EFI/UEFI) and bootstrap. ARM doesn't have a standard bootstrap so each vendor may do it a bit differently. This means that it won't be as easy to boot Windows RT on multiple ARM devices as it will be to boot Windows 8 on multiple x86 devices.
Apple didn't do anything like how MS is handling it. Apple tries to make jailbreaking illegal. I don't have any love for MS, but it's only fair to give them some credit. Anyone who cares about putting non-MS approved applications on their Windows tablets would be more than willing to spend a few seconds to do so and anyone who doesn't care about it would benefit from an extra layer of security. It seems like a win win situation to me.