This is an awesome tool for developers... Really great way to quickly search core and find the info you are looking for. I feel like 9 times out of 10 the full codex page is overkill for me. I'm usually just looking to see if a function already exists, or how to modify it. I also think this will help developers discover new functionality in WordPress because of the results a simple search returns. In the long run this will definitely contribute to better written code by plugin & theme authors.

I didn't even know I wanted this, and I already can't live without it.