I remember it well.Actually, there were i5 processors, but they were on the LGA 1156 socket. They were mainstream processors whereas i7-920 on up were enthusiast processors on a different socket. It's the same thing today, but the sockets are LGA 1150 (mainstream) and LGA 2011-3 (enthusiast).
I was going to get my wife an i5 750/P55 build but she insisted on an i7 920/X58 build.
And she was right.