I have just read elsewhere that there were teething problems last week. However, I quote:
... I am hopeful that we can start the
process of releasing it today.
The initial phased deployment consists of only a very basic search, which will be enhanced over the coming months to incorporate more features, to bring it up the the level of features that people have already come to expect from our search engines!
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The italics are mine - remember they are releasing it slowly over a couple of weeks to blocks of IP addresses, and it looks like we shouldn't expect too much of it at first.
Cheers
K.

Update: It is now live. If you click through to try to search, it will tell you how long you have to wait before you have access. I only have 20 hours to wait - other people have up to 82 days!