Oddly enough, I had Sherlock open five minutes ago for the first time in about two years. Just because I spotted it in my Applications folder, and just to see if there was anything I'm missing.
Nope.
The AppleCare search plug-in was okay, I guess, and might come in handy someday. But everything else has been pretty much surpassed. Then again, it never came close to Watson, so it was outdated in its time.
The Sherlock developer page is still up, but the page under the Jaguar features is gone.