prashanthks had sent this link along quite sometime back and I watched it only today. Sad. The worst ones were those where the fuel ignites and the car burns with the driver still inside...the marshals are unable to stop it since the flames are simply too much to fight with fire extinguishers.
I still remember Senna...the others I was too young to know about but Senna is etched forever in my head.
12 years down the line, I'm extremely thankful to those who made Formula 1 as safe as it is today. No driver's life has been threatened post 1994 although there have been some very nasty accidents.
I hope it continues to be this way. No one should die racing in F1 again.