Everyone uses the standard search engine for general stuff. But if you need a specific solution, often the ability to search the "newsgroups" and other mailing lists can be a real time saver. Hope this helps solve your problems!

Borland Products - http://info.borland.com/newsgroups/ngsearch.html

Apache Jakarta Archives - http://jakarta.apache.org/site/mail2.html

Java Technology - http://forum.java.sun.com/ (The Search is on the lower right corner of the page)

UseNet Archive (20 years of stuff) - http://groups.google.com/