ZOE is interesting, I'll pay that. But there are dozens of personal free and payware search tool around that can index files, directories and data stores on your local drive.
A personal Google would be nice, however prior experiments with this such as Altavista Personal Search seem to have failed miserably a few years ago as people just don't get the concept.
I use dtSearch Desktop which integrates with everything I use, email, apps etc. I have an index of 2.4 million words, 402MB in size! I find it invaluable and have used it for sometime.
Agreed on Lotus Notes, the often overlooked fast and versatile full-text search in Notes is an easily accessible feature for Notes mail users who use it very often. Rarely do you see a Notes mail user scrolling through an archive to find an old email. They're well accustomed to a fast full-text search.
Really feel this is a rehash, but perhaps the article will remind people there are dozens of tools out there worth looking at.