Richard Demers connects the IBM AS/400 (which has an object/capability based OS) and Smalltalk.
The AS/400 is an interesting animal. Actually, seven years ago Dave Thomas (founder of OTI, bought by IBM) gave a keynote talk to Gemstone's company meeting. There he suggested that Gemstone Smalltalk be ported to the AS/400.
I am not sure the suggestion was seriously discussed at the executive level. The company shortly after decided to take on IBM, Sun, and Oracle in the Java/J2EE market. (This was before Weblogic made a name for itself.) And the rest is history... Smalltalk is still their cash cow.