Technical achievements are great; but Gabriel is much better placed. He is self funded, he is building on existing tools (always good advice), he leveraged us, the hacker crowd, who can be very loyal, he clearly listens to his customers etc.
Cuil, on the other hand, produced some very confusing (if technically interesting) things and then ranted about those who criticised them. They had a lot of big bucks VC money (always a warning sign) and didn't appear to be leveraging loyalty from any user base.
Even if the problems these two startups are facing are different; there is a lesson here. One is how not to build a product, and one is :)