Seaside is a somewhat heretical web framework. They generate their HTML. They don't embrace meaningful URLs. They use Smalltalk, of all things.
Of course, by making these crazy choices, they get insane amounts of power. When we were building Jifty, we stole liberally from everything that had good ideas. We dragged Rails down a dark alley and rifled through its pockets. We grabbed Catalyst's wallet.
But really, Seaside's killer features like Continuations and Halos...just stopped me in my tracks. Once we got them into our grubby little perlish hands, I realized: This is the way development is supposed to be.