The answer is yes, it has been rooted. Paul, better known as Modaco, has done it again. Shortly after being released in the UK, he has managed to root the Streak in seemingly record time. This tablet was just released yesterday and it was rooted the same day. At least this time the product actually made into the market. He rooted a few handsets before they was even released to the public.
If you're in the UK and you have a Streak, thanks to Paul you can now unleash its full potential. There's currently no custom ROM's to flash but there are a few apps on the market that can add extra features to your newly rooted Streak. Paul will surely have a ROM released in a few. Instructions on how to root it yourself should be up shortly, stay tuned.