I was just visiting a site dedicated to a reel-by-reel, practically shot-by-shot examination of Alfred Hitchcock's film North by Northwest (mentioned here earlier) and I came across this perfect description of Cary Grant:

"...he mixes the light-comic sophistication of an Alfred Lunt and the music hall clowning of a Charlie Chaplin with the glamour of a fashion model and the athleticism of a Hollywood action hero."
James Naremore (North by Northwest, Rutgers, 1993)

I guess I'll be on the lookout for Cary Grant movies this weekend.