The data explorer on their site (http://cablegate.wikileaks.org/) is interesting but I really wanted to search for specifics instead of browsing by category, so I quickly hacked this fulltext index together.
That's a fair question: it is not better than Google. You see, after I got my hands on the data, I wanted to do something, anything, with it - and it occurred to me that nobody else was offering a way to explore the data beyond the categorization that Wikileaks was doing.
I'm interested in what people are looking for in the documents. It's actually quite hypnotizing to watch the log scroll by. Sure, it may not be the most creative idea, but then again, it doesn't have to be (case in point: nothing I ever did got this much traffic) and it took, like, 2 hours total to make.