This is becoming an increasingly common occurrence across the globe, and you can bet for every time you hear about such a mistake, there are a few dozen data security breaches which are covered up.
46,500 people affected pales into insignificance alongside the size of breaches by the NHS and local council authorities for example which often run into the millions of records.
<exaggeration warning>Chances are, if you've been alive for more than a week then some of your data's probably been leaked somewhere. More than once.</exaggeration warning>
So, fresh perspective, your name isn't sensitive information. Chances are your email address isn't all that sensitive either (are they both on your business card? You've never lost one of these incredibly sensitive wallet-sized documents, or handed one to someone you don't know right?)
If it was financial or medical details I'd be livid, but with a sense of perspective it's not all that bad.
At least the senders of junk mail might start spelling my name right now. And if they know I've got an interest in IT it might even be well-targeted spam. Exciting.