My impression was that Lernout & Hauspie had had decent--for the time--technology: they bought Dragon (admittedly in a shady deal), PowerScribe, and a few other "real" companies. It was certainly rougher than people might have desired, but this is the first time I've heard they didn't have any actual products.
I thought its downfall was more related to straight-up accounting fraud, with fake sales, hidden loans, etc.