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Taking it one step further us CS dorks like to search using the power of regular expressions!
And don't even get me started about their case (in)sensitivity.
The last major feature is the social aspect of search, which I think is more hype than substance at this point, but I could be wrong.
Imagine being able to specify the type of matches that that is language dependent -- is it the name of a class, variable, method, only in the comments? Could the search engine perform "code translation" where you translate Java into C# and vice versa?
That would be very awesome, especially if you were trying to learn a new language.