Furthermore, blogger complains if you try to embed the example code in an iframe. So I've had to host it at another machine and set the src of the iframe to that address. And for that I need another key - for the domain of the other machine... Not exactly easy to use.
In comparison, Yahoo's search APIs are much more complete and much more elegant and useful.
All-in-all - a very early look at something, at least they're not shy about putting out half-baked clams... which is a good sign.