Unfortunately there's been some great games that never caught on. Take Majestic from EA! for example. It was truly unique. You played yourself, putting together a puzzle that gaves you clues through instant messenger, dummy companies websites, and even calling your cell phone with threatening messages.
Ahh the joys of waking up to a death threat at 3am.
Such a great concept, but the following on it died shortly after 9/11 and it was cancelled
I was already on Episode 3 & everything.