Recently there have been plenty of Important Stories in this newspaper -- articles about politics and sports and crime and so forth. But I'll bet there are plenty of people who agree with me that the Most Important Story concerned the survival of Riverdale's Motor-Vu Drive-In.Yours truly was just plain tickled to learn that owner Brent Coleman has found digital projectors to replace the theater's soon-to-be obsolete 35-millimeter film models. But my joy was tempered when the story noted that Brent's father, Howard, had passed away last year. Despite the fact that my movie reviews had the potential to harm his ticket sales, Howard was always kind to me during my years as a film critic for the Standard-Examiner. My affection for drive-ins comes from summers growing up in Wyoming's Big Horn Basin, where I patronized the Cory Drive-In. It was like every other rural American drive-in theater in the 1960s: gravel lot, bermed rows punctuated with evenly spaced speaker poles, a concession stand lit with yellow bug lights, and restrooms with toilets you prayed you never had to use; the urinals - two metal troughs bolted to the walls - were bad enough.