I have been playing around with this new (test) feature and have a few more comments.
First, it is irritating that it does not yet respect your search customizations. I like 100 results per page, but Code Search puts up 10 whether you want it or not.
Second, it is evident that quite a bit more of the published source code from books is now easily findable. The publishers switched from floppies to CD-ROM and later removed CD-ROMs from books to cut costs. They probably did not think their book code would be reachable this easily.
Third, there is quite a bit of application sample code that shows the default connection strings for databases. For example, this search page for “password” gives you the default data for an Oracle login with the helpful comment “a base string is created and options are added this uses the hr schema with the default password make sure to adjust this for your environment.” /. is on it.