As many of you know, I used to work on documentation like whitepapers and Books Online for SQL Server. One of the main problems I've found with our documentation isn't that there is not enough content - we have over 65,000 pages in BOL alone - but that it is hard to find. The search tool inside the "fat" client of Books Online doesn't always hit the right topics, for a lot of reasons. And if you go to Books Online on the web, the search box there searches ALL of MSDN or TechNet - not what you're looking for.
So the documentation team came up with a couple of macros for Live Search, and that's what I use all the time now. Try it here for SQL Server 2005: http://search.live.com/macros/sql_server_user_education/booksonline
And here for SQL Server 2008: http://search.live.com/macros/sql_server_user_education/sql2008bolsearch/
2000? You're on your own, I'm afraid. Time to upgrade!