While Google/Bing/etc are great for searching public sites (when you can tolerate the latency between when content is posted and when google indexes it), they d

While Google/Bing/etc are great for searching public sites (when you can tolerate the latency between when content is posted and when google indexes it), they doesn't work at all for sites which are private/intranetted/password-protected or otherwise inaccessible to web crawlers.