@Sylon, it should be on Cydia today for free. More info here.
http://www.idownloadblog.com/2012/06/04/mountainlioncenter/
@WeegieMac, It's not possible to access someones device without knowing the root password. If you change it in Terminal from the stock password, it's impossible to access the device through SSH. The jailbreak team explained this recently at the jailbreak conference. I agree with you that Cydia is full of bad tweaks and bad themes but at least you get to choose whether to add it or not. That choice is the reason why people do it.
There is also many, many useful things that help to make the experience much better and more convenient.
That Notification Center tweak looks very smart, I'll give you that. The stock Notification Center on the iPad is very poor indeed.
On the video, there looked like there was a stutter or little 'skip' in the beginning of the animation when swiping the screen away to reveal 'MountainLionCenter' ... can anyone who's tried it on a new iPad tell me how it performs, smoothness wise?