@google: give us a truly wiki-like public entry on SideWiki, with wiki functions like revision and restore and spam-reporting and we will garden it.
There'll probably be large scale spam and trolling, but with some good design, wiki revisions and restores, along with maybe a tight linking to google accounts before granting edit, perhaps wiki principles will out.
Oh, and there's no reason why the public entry shouldn't work as just another entry alongside all the others, only rising to the top if it gets voted there.
I remember digging the first "wiki margin for the internet" i saw, i think about 5 years ago. wikalong - a firefox extension and a promising idea i thought - a firefox extension that let one create/edit a wikipage for any web page out there.
so when google recently(ish) announced their Sidewiki , and it turned out to be more of a side blog i tried shouting out that bit above.
But now maybe I'm not so sure anymore. Maybe, rather than google's one and only sidewiki, we need an open extension that allows us to choose which side wiki community we want to follow and contribute to..
like a host of wiki channels for discussing the web. many internet margins - with choices between real wiki's, public and private, and sideblogs (like the current google sidewiki)