You dont have to wory to much about a calvin and hobbs movie- its creator (waterson) hates the thought of marketing and lisensing in hollywood. Read the book Searching for Calvin and hobbs to find out more.
I agree with this list though I would add the lockhorns and beetle bailey as well.










Okay, the Family Circus one was genius.
Just out of curiosity, were you aware that there was a series of films based on Blondie and a radio program, and that both ran from the late '30's until 1950?
Actually, the backstory of Blondie sounds like a premise for a movie: for the first few years of the strip, Blondie was a single flapper girl. Then, in 1933, she married Dagwood, who came from a wealthy family that disinherited him for marrying Blondie. Comedy or dramatic gold there.