jQuery might've over-done it a bit with their most recent refresh, but that's a better example of what could be done.
The search feature, for instance, is complete garbage. If I'm typing in a method name, give me that method, not this: http://ca2.php.net/results.php?q=mysql_query&l=en&p=all
Is it so hard to do something like auto-complete? Wikipedia and many other API references do this.