Man I used to develop SAAS software using Cappuccino. Since I knew Objc (and JS/CSS) really well it was such a beautiful system for development. I'm sad it never went anywhere
Cappuccino improved upon javascript by using a different language (objective-j) that added many features js didn't have, and it used the same (mostly) well-honed api as AppKit. In comparison to other js UI frameworks of its time, it was lightyears ahead.
PS: Compare to today, with code slop (and good agent-mediated code: It also increases overall speed).-