Netbeans 6.5 comes with a useful, generic, search functionality. You can type in the Search Box in upper right corner (Ctrl+I) whatever you want and Netbeans will try to find for you the results in the following categories: Actions, Types (=Class, Interface names), Options and Help the results. Nice thing: it caches the "Recent Searches" - what I use a lot.
Interesting: if you do not know exactly what you are searching for, you can type first characters and then hit Ctrl+Space keys to expand your query-term. This is actually amazing - a meta-search :-).
The first time you are searching, it takes a few seconds. I have now 57 open projects, it took 2 seconds to perform the first search, what is o.k.