Findability continues to be the bete noire of technical communication. This may be a parallax error, but it seems that findability is more of a problem in technical communication than in other fields. The reason, I suspect, is that many technical documentation suites are too big to browse but too small to search.
I have commented before on the somewhat counter-intuitive phenomenon that on the Web it is easier to find a needle in a haystack (The Best Place to Find a Needle is a Haystack). This may be counterintuitive, but it is easy enough to explain: search (if it is any more sophisticated than simple string matching) is essentially a statistical analysis function. A search engine works by discovering a statistical correlation between a search string and a set of resources in its index.