Bill Watterson has an official blurb at the Andrews McMeel Universal Web site endorsing Richard Thompson's talent and his strip CUL DE SAC specifically.
Big hat tip to Tom Spurgeon today, who writes most aptly:
"... Bill Watterson's endorsement is part of the sales package. That's sort of like getting JD Salinger to do a cover blurb."
Related: The Daily Cartoonist asks Richard to name his top fave cartoonist influences.